Abstract
Purpose of Review
Recent reports of a “loneliness epidemic” in the USA are growing along with a robust evidence base that suggests that loneliness and social isolation can compromise physical and psychological health. Screening for social isolation among at-risk populations and referring them to nature-based community services, resources, and activities through a social prescribing (SP) program may provide a way to connect vulnerable populations with the broader community and increase their sense of connectedness and belonging. In this review, we explore opportunities for social prescribing to be used as a tool to address connectedness through nature-based interventions.
Recent Findings
Social prescribing can include a variety of activities linked with voluntary and community sector organizations (e.g., walking and park prescriptions, community gardening, farmers’ market vouchers). These activities can promote nature contact, strengthen social structures, and improve longer term mental and physical health by activating intrapersonal, interpersonal, and environmental processes. The prescriptions are appropriate for reaching a range of high-risk populations including moms who are minors who are minors, recent immigrants, older adults, economically and linguistically isolated populations, and unlikely users of nature and outdoor spaces.
Summary
More research is needed to understand the impact of SPs on high-risk populations and the supports needed to allow them to feel at ease in the outdoors. Additionally, opportunities exist to develop technologically and socially innovative strategies to track patient participation in social prescriptions, monitor impact over time, and integrate prescribing into standard health care practice.
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Introduction
The need to belong and to connect with others socially is widely considered to be a fundamental human need [1]. Without a sense of belonging and positive social connections, individuals may experience a sense of deprivation that can lead to loneliness, depression, anxiety, and anger [2,3,4]. Meanwhile, there are scores of studies and scientific reviews that document that the natural environment and ecosystem services it provides can enhance health and well-being, with a particular emphasis on the psychological well-being derived from contact with nature and outdoor activity [5]. This article aims to explore the current evidence for understanding the use of social prescribing (SP) (i.e., non-clinical referral options) as an umbrella social intervention to promote social connectedness and ultimately improve mental, cognitive, and physical health. Moreover, it explores the opportunities to focusing the lens of social prescribing on activities that hold the most promise to activate intrapersonal, interpersonal, and environmental processes that are critical to health and well-being. Finally, it reviews the current literature with an eye towards addressing opportunities to reduce social isolation among populations at risk, including, but not limited to, teenage moms, recent immigrants, older adults, and economically disadvantaged and linguistically isolated populations.
Background
Mental health concerns account for 20% of all primary care consultations [6]. The presence of social risk factors such as social disconnection is so significant that the US-based Institute of Medicine recommends that health providers collect data on patients’ social connections and isolation in addition to overall physical and mental health, education, and lifestyle [7]. Social connection, or lack thereof, is considered a social determinant of health, with well-documented health consequences [8, 9]. These factors are shaped by the environments where we live, work, and play [10] and the inequities that result from how our everyday built environments are designed, developed, and redeveloped. That is, the way we build and organize our cities can foster, complicate, or hinder social connection.
Social connections can be understood through three main dimensions—their functions (e.g., perceived loneliness), their structures (e.g., social isolation), and their qualities (e.g., marital quality) [11]. Loneliness is described as the subjective, unfavorable balance between actual and desired social contacts [12]. That is, loneliness is a painful, unwelcome feeling. People lacking human contact often feel lonely [13]. There is robust evidence that loneliness can compromise physical and psychological health [2, 14]. In recent years, loneliness has been framed as an “epidemic” sweeping across populations in the USA and Europe [15, 16].
Social isolation is within the structural dimension of social connection [17,18,19] that is defined by limited social networks, infrequent social contacts, lack of trusted connections, living alone, and lack of participation in social activities, and is a known risk factor for dementia, depression, cardiovascular disease, and mortality [11, 20,21,22]. Importantly, the effect of social isolation on mortality has been estimated to be equal to or higher than that of other risk factors such as obesity or smoking [9, 23].
In a national survey of health care providers, 85% of respondents opined that unmet basic needs, influenced by social domains, such as access to healthy food, reliable transportation, and adequate housing, are contributing to declining health status for all Americans. Moreover, 80% of respondents reported that social needs of their patients are as important as their medical conditions and that this is particularly true for patients coming from low-income neighborhoods. Finally, providers reported that if they had the option to write prescriptions for social needs, they would include prescriptions for fitness programs, transportation assistance, and healthy food [24•, 25].
Vulnerable Populations
A number of factors may contribute to increased risk for social isolation. Living alone, lack of participation in social groups, having few friends, or strained relationships all are elements of social isolation. Retirement and lack of mobility also increase vulnerability [9]. This includes older military veterans who experience loneliness and social isolation [26]. The number of adults age 65 and older is expected to more than double in the next 25 years—eventually accounting for over 20% of the US and European populations. Given that social isolation among older adults is a predominant health problem, it will likely increase as this segment of the population expands [27]. Therefore, the importance of health-promoting activities and services to address loneliness and social isolation in older populations is increasingly recognized [28].
Immigrants and refugees represent other social groups that often face cultural, social, economic, and linguistic challenges living in a new and unfamiliar place [29]. Scholars attest that loving and close family relationships are a key determinant of positive resettlement outcomes for refugee youth from conflict-prone areas [30]. Yet, migrants’ small, fragile social networks and inadequate informal support structures heighten barriers to accessing social services. More research is needed to understand immigrant and refugee’s specific social support needs and resources [31].
Social connection is a major public health challenge among adolescents as well [3, 32]. The youth from low-income communities encounter greater barriers to forming connections due to frequent moving, substance abuse at home, poverty, and discrimination. Over time, stress accumulates to further amplify poor psychological outcomes [33]. Furthermore, youth from marginalized communities often go without the necessary support to navigate the difficult transition into adulthood and independent living [34]. Developmental changes occurring during the teenage years increase the risk of physical isolation from others and feelings of loneliness [35]. With suicide now the second leading cause of death in American individuals age 10 to 34, the promotion of positive relationships at home, with friends, and in community as a preventive measure is receiving increased attention [36].
Social Prescribing as a Path Towards Addressing Community Social Needs
What Is Social Prescribing?
The practice of social prescribing provides physicians, nurses, social workers, and other licensed professionals with non-medical referral options (e.g., housing subsidies, food vouchers to attend farmers’ markets, community arts activities, walking clubs, cycling, communal gardening) that work in concert with existing treatments to support connectedness and by extension, mental well-being, health behaviors, and physical health [37, 38]. The use of social prescriptions, also referred to as “connection prescriptions” [22] or “community referrals,” links screening programs with social action and should involve not only health care providers but also third sector organizations such as local non-profit organizations, local municipalities (e.g., social services and schools), recreational facilities, neighborhood organizations, and affected populations. Such partnerships represent a holistic strategy for confronting persistent health inequities, addressing unmet psychosocial needs, and reducing health care office visits [38,39,40,41].
In Fig. 1, we visualize the concept of “social prescribing” (SP) through a broad lens that envisions socially oriented nature-based interventions to foster and sustain social connections and consequently reduce the risk of social isolation and loneliness and promote health and well-being. SP is a structured therapeutic intervention that targets psychological processes and requires direct participation in everyday environments in order to activate the processes that support social connection and promote and sustain pro-health behaviors (e.g., physical activity and nutrition) and well-being [42,43,44,45].
The research described in this review covers the theoretical basis and empirical evidence for establishing a green-outdoors bent to social prescribing, which includes reviews of park prescription programs [46], group hiking prescriptions [47], farmers’ market prescriptions [48], “Walk with a Doc” programs (https://walkwithadoc.org/), and exercise referral programs [49,50,51]. These social prescriptions take various forms, such as referrals for high-risk patients to weekly, biweekly, or monthly guided outdoor activities with provided transportation [44••, 47], or open-ended, digitally supported prescriptions outlining expected duration, intensity, and frequency of outdoor physical activity [24•].
The applications of SP are diverse and can be used to benefit any condition that might be improved through behavior change, increasing activity, and increasing connectedness—all three being related. SPs in the European context have been aimed at obesity and diabetes, addiction, literacy, and compliance with treatment. In Barcelona, for example, social prescriptions have been used in primary health care centers in the metropolitan area of Barcelona. This program found significant improvements in emotional well-being and social support among patients (N = 85), mainly women participating in a pre-post pilot study [52]. SP has proved to be useful in helping patients but also those that hyper-use (more than 12 visits per year) primary care services [42, 53,54,55,56]. Early studies of these programs demonstrate that patients following SP show improved self-esteem, self-efficacy, and confidence and mood [37, 52, 57,58,59,60,61].
Adding a Nature-Based Emphasis to Social Prescribing
Over the past decade, the evidence suggesting that nature contact is good for various aspects of physical and mental health has grown substantially [62]. Consequently, an increasing number of US health insurance companies are beginning to invest in nature-based prescriptions as a way to promote time outdoors and time being physically active. For example, Kaiser Permanente partnered with the Golden Gate National Parks Conservancy to fund health-focused park programs and park prescriptions [63]. Additionally, Blue Cross Blue Shield incentivizes North Carolina clinics for participating in Track Rx, a program to help families learn how spending time in nature improves their overall health and well-being. Recreational Equipment, Inc. (REI), a leading US outdoor recreation retailer, recently invested $1 million in the University of Washington’s EarthLab that studies the connection between human health and time spent outdoors (https://www.rei.com/blog/news/a-dose-of-the-outdoors), with a particular interest in how to operationalize prescriptions programs in low-income areas and to use this evidence to influence national policymakers, decision-makers, and local and regional leaders in advancing programs and policies that support nature-based connections.
The primary avenue in the literature connecting nature to improved mental and physical health is through nature’s restorative and stress-reducing qualities [64, 65]. However, the social connectedness experienced while spending time outdoors with others is increasingly being explored as another avenue to reduce stress and encourage children’s cognitive development [66,67,68]. While there are a several published evaluations of nature-based prescriptions, the scholarship around evaluating nature-based interventions and social connection is limited. However, there are a number of relevant programs that we draw upon on to better understand how the mechanisms that inform how nature-based therapeutic prescriptions can function under the broader umbrella of social prescribing.
Approach
We conducted a literature review using key search terms to identify published studies that evaluated prescription-based interventions to address health issues such as physical inactivity, poor nutrition, stress, or social processes such as social connection. We considered interventions that fit within our broader lens of nature-based social prescriptions that included a clinical referral to outdoor activity. Search terms included “social prescriptions,” “social prescribing,” “community referrals,” “nature prescription,” “connections prescription,” “walking prescriptions,” “park prescription,” “nature-based,” “social connectedness,” “green exercise,” “physical activity counseling,” and “outdoor prescriptions.” Selected articles included a prescription element, were tied to clinical care, and integrated proximal outcomes that were rooted in social connection or social connectedness in and of itself. The literature review informed our proposed model (see Fig. 1), which suggests that nature-based social prescription increases social connectedness and influences physical health and mental well-being by certain intrapersonal, interpersonal, and environmental pathways.
Nature-Based Social Prescription Targets Proximal Intrapersonal, Interpersonal, and Environmental Processes to Motivate Lasting Change
There is debate surrounding the mechanisms by which nature promotes therapeutic experiences [62]. These studies, although limited by small sample sizes and few experimental studies, suggest that nature can be beneficial in promoting recovery from stress and fatigue [69]. Ulrich’s Stress Reduction Theory (SRT) hypothesizes that environmental features induce subconscious affective reactions which support psychophysiological stress recovery. Landscape features such as vegetation and water inspire positive emotions and reduce negative thoughts, while maintaining non-vigilant attention [70]. The Kaplans [71] argue through the Attention Restoration Theory (ART) that nature has the capacity to renew attention and promotes wellness via reduced mental fatigue. In keeping with ART, a person can focus with “effortless attention” upon “soft fascinations” easily found in the natural world, such as leaves moving in the breeze. Scholars have argued through the theory of Biophilia [72], people possess an innate tendency to focus on life and lifelike processes and to respond with emotional intensity to the natural world. Wilson describes how humans are drawn to nature-like patterns and stimuli and lifelike processes because of a primary exposure to nature during human evolution. He argues that there has been little genetic adaptation recently to modern, urban environments [73].
These leading theories have engendered an extensive body of evidence that exposure to the natural world may have a significantly positive impact on human health and well-being. The model presented in this paper builds on the evidence of how nature-based interventions impact population health, by exploring the role of social connection in the outdoors. Little is known about the effects of social connection in the outdoors as another possible mechanism underlying the positive relationship between wellness and nature [74]. It is unclear if and how mental fatigue (ART), stress (SRT), or emotional engagement with nature (biophilia) may be impacted by social connections in natural settings and consequently influence health and mental well-being, as few studies have explored these potential mechanisms. However, research has shown that connecting with others in nature can break down barriers between community members [69], increase feelings of connectedness with others [75], and reduce stress [44••].
Understanding the theory supporting behavioral interventions can help us understand what empowers individuals to make healthy decisions [76]. Relevant studies from our literature review are included in Table 1, which describes the intervention, the primary outcomes, and the social and psychological processes that are theorized to influence pro-social, pro-health, and pro-environmental behavioral outcomes. Intrapersonal processes that give way to social connections and longer term outcomes included factors such as participation in an activity (competence), sense of belonging, sense of enjoyment, sense of purpose, and sense of awe. Interpersonal processes included social involvement, relatedness, and shared learning. Environmental processes included access to nature, perceived neighborhood attachment, and perceived aesthetics.
Intrapersonal Processes
Participating in outdoor activities and being in proximity to nature can influence internal processes such as autonomy, competence, sense of belonging, sense of purpose, and sense of awe among others. These relationships can be understood through the lens of self-determination theory, which poses that the driving force behind behavior change comes from within an individual. The theory asserts that an individual’s self-regulation relies on both intrinsic motivation and well-internalized extrinsic motivation [81]. According to self-determination theory, for optimal growth and function, three universal psychological needs must be met: the principles of autonomy, perceived competence, and relatedness to others [82].
Building on these processes, exercise referral schemes represent a referral model in primary care settings to promote physical activity and reduce sedentary time. Usually participants are directed to sports centers or leisure facilities for exercise programs. The effects are often short-lived [51]. However, the use of social prescribing with enhanced self-management strategies (e.g., individual goal setting, self-monitoring, prompts and cues) have the potential to strengthen the impact of such measures in fostering physical activity behavior change, and in turn, affect mood and feelings of connection if the activities are done within a group context [49, 50]. Moreover, these strategies can be linked with nature-based solutions, promoting access to social and natural settings and open spaces [83].
Farmers’ markets offer another type of outdoor environment that represents a social, civic place that is often located in parks or public plazas and connects people to urban agriculture and fresh, locally produced food. In one study, Trapl and others introduced a produce prescription program for pregnant women in underserved areas with limited access to fresh produce [48]. Health care providers offered nutritional counseling and $40 farmers market vouchers to participants at monthly prenatal visits. Fifty-six percent of study participants redeemed at least one farmer’s market, and 95% of participants found the program materials to be relevant and useful. This strategy to incentivize fruit and vegetable consumption through a prescription empowers women in this study to engage in healthy behaviors by tapping into psychosocial processes such as autonomy, competence, and belonging among others. Moreover, it connects women and their families to an interactional space in their respective communities.
Looking to other intrapersonal pathways illustrated in the literature, Taylor and Kuo examined nature’s effect on concentration by guiding children professionally diagnosed with ADHD on 20-min walks in natural and urban settings [80]. After each walk, concentration was measured using Digit Span Backwards. Participants concentrated better after a walk in an urban park than after a downtown or neighborhood walk. Effect sizes were substantial and similar to those reported for drug prescription for ADHD.
Building upon this evidence, Anderson and others [77] explored the impact of emotional experiences in the outdoors on well-being by analyzing how the awe experienced during whitewater rafting trips predicted greater improvements in well-being and stress-related symptoms than the effects of other positive emotions such as joy, contentment, and gratitude. To test this, researchers developed 1- to 4-day whitewater rafting prescription for veterans and youth from underserved communities. Participants completed a daily rafting diary detailing the emotions, cognitions, and social interactions they experienced. The study found that the rafting trips produced substantial and significant improvements in overall well-being and feelings of awe [77]. Research by Zhang and others [84] found a moderator effect of engagement with beauty in nature on the relationship between connectedness to nature and life satisfaction and self-esteem. These cases highlight how emotion and sensations inspired by natural surroundings might be a mechanism of how nature improves health and well-being.
Community gardens have the potential to ignite psychosocial processes and, in turn, influence health behaviors and mental and physical health. They are understood as social green spaces where people from more than one family garden communally or side by side [76]. Qualitative research with community gardeners illustrates that reasons people garden are largely driven by intrinsic motivations and sensory experiences to feel good, to put ones’ hands in the earth, and to learn a new skill, consequently not simply to improve their physical health [43] and align with the biophilia hypothesis described above [72]. This has practical implications for providers prescribing nature activities in order to reduce stress and motivate physical activity and social interactions with others. Clients experiencing competence and autonomy as well as a sense of enjoyment, awe, purpose, and belonging may be inspired to commit to nature-based therapeutic services and therefore are more likely to experience a boost in mood that providers can build upon to address other therapeutic goals [79].
Interpersonal Processes
Moving beyond nature’s cognitively and mentally restorative qualities, outdoor experiences can facilitate dynamic processes of social or interpersonal interactions [66]. Positive social interactions among adults have been shown to lead to better health and longevity when compared with more isolated peers [85]. Studies of older adults found that enjoying leisure activities with friends, spouses, and family played a significant role in the older adults’ degree of participation, and leisure activities made up a notable portion of their social worlds [86]. In addition, small regular group meetings with an education focus and groups where participants participate actively were among the most effective interventions in the literature at reducing social isolation and loneliness [21, 87] and in longer term chronic conditions such as diabetes [88].
Yet, what role does nature play in facilitating social interaction? Recent studies suggest that outdoor experiences may facilitate social involvement and shared learning. Izenstark and Ebata invited mother and daughter dyads to walk through a natural area and a shopping mall for 20 min each [78••]. Results showed that the nature walk was perceived as more fun, interesting, and relaxing, and it contributed to greater cohesion between mother and daughter. The study highlights the importance of exposure to nature in families’ everyday lives and strengthens the case that active outdoor leisure activity experiences can influence and fortify family bonds [89].
Returning to the theme of community gardens, these settings represent examples of specific outdoor environments that amplify social cohesion, support networking, relatedness, and increase levels of social capital by providing a cohesive “third space” for gardeners to congregate [90, 91]. Community gardening brings residents together in the sharing of seeds, tools, recipes, and produce [92]. Furthermore, these spaces create opportunities for people to meet and interact with others through the organization of group work days and social events, volunteering, conversation, gathering, and learning with others [93, 94]. These social interactions are key to promoting neighbor-to-neighbor connections, collective efficacy, and one’s sense of place within communities [43].
Being exposed to nature is hypothesized to decrease feelings of loneliness by helping to build relationships that can reduce stress [95]. In a pioneering randomized trial with low-income families exploring the impact of physician counseling about nature with or without facilitated group outings, Razani and others discovered that 3 months following the Stay Healthy In Nature Everyday (SHINE) parks prescription, participants’ feelings of loneliness decreased by 1.03 points on a 9-point scale, and stress reduced significantly [44••]. This supports the suggestion that frequent, daily contact with nature may be most effective in reducing stress [96], as increases in weekly park visits were associated with incremental decreases in stress [44••].
Perceived Environment
The design of our built environment and the areas where people live, work, and play are directly related to the amount of time people spend outdoors [97]. The layout of our communities, transportation infrastructure, and access to parks and trails generate either obstacles or opportunities for people to interact with nature [98]. Our model (Fig. 1) illustrates how access to nearby nature and outdoor resources are critical for health and well-being. These attributes can include presence or absence of parks [99], gardens [100], or farmers markets [48], and also involve how people feel when experiencing these places, and what impact living near them can have on mental and physical health and well-being.
The ways in which people perceive their environment may involve the bonds people have with these places, also known as place attachment or a broader sense of beauty, e.g., aesthetics. Neighborhood attachment, one facet of place attachment, relates to an emotional bond to one’s neighborhood that may influence access to and use of everyday places [101]. The bonds may be key to explaining how the built and natural environment influence behavior and longer term health outcomes [102,103,104].
One’s perception of the form of the surrounding built environment is shaped, in part, by landscape experiences, such as aesthetics [43, 105,106,107]. Environmental aesthetics can be understood as the study of appreciation of the environment, how this appreciation changes as people interact with the environment, and how these experiences guide future aesthetic interactions [108].
Yet, how do aesthetic experiences relate to physical health? According to Bronfenbrenner, human development is influenced by the larger environmental milieu [109]. With this understanding, community gardens represent a strong example of how human development occurs in the social context beyond individuals. Gardeners express positive feelings of pride and joy in relation to their gardens [71]. Gardens provide opportunities for multisensory experiences while digging in the soil, harvesting produce, and experiencing quietude and birdsong. Gardeners express enthusiasm over how their vegetables taste and the confidence that they gain from socializing with other gardeners. Sharing personal histories with others, working in partnership to create beauty for others, and physically slowing down and mindfully appreciating fresh air, and horticultural beauty contribute to psychosocial well-being [43]. Research with community gardeners found that these kinds of aesthetic experiences generate meaning for gardeners, which may lead to positive health outcomes such as reduced stress, depression, and social isolation [90, 110].
In an example illustrating how environmental processes can be encouraged in nature-based social prescriptions, Passmore and Holder [79] instructed undergraduate students to photograph and reflect upon their natural and built surroundings for two-weeks. Participants paid attention to how nearby, everyday nature made them feel, photographed the landscapes and objects that evoked emotion, and described the emotions that arose. Researchers found that increased attention to everyday nature in this case significantly increased overall sense of connectedness and pro-social orientation. Importantly, the significant effects of noticing nature on well-being did not depend upon the trait levels of connectedness to nature or engagement with beauty that was already characteristic of each individual participant.
Future Directions
Nature-based social prescriptions offer health care providers with a valuable opportunity to help adults and children find ways to feel more socially connected and be part of their larger community and natural environment. The developing practice represents a low-cost, creative intervention to strengthen social networks, reduce stress, and facilitate social connectedness among participants and providers without requiring expensive gym memberships or special clothing to access a local park or natural area with friends, family, or groups. These prescriptions fill the need to focus on interventions that harness nature’s beneficial impacts and bestow a powerful effect on population health. By aligning clinicians and social workers with community members, we can move closer to creating socially connected and physically active communities.
A next critical next step is to adopt social isolation and loneliness screening measures for health centers to gauge the extensive of these conditions. Along with standardized screening approaches, research is needed to co-create prescriptions that are reasonable for those who prescribe them and meaningful for the people who need them. Refreshing clinical preventive health care can buoy provider spirits to generate solutions for low-income, isolated, and hard-to-reach individuals [47].
In addition, more research is needed to understand non-dominant communities’ access to and connection with natural areas, including, but not limited to, minority and low-income populations and recent immigrants. It is clear that all sociocultural groups do not share the same relationship to the outdoors. For example, there is a general tendency for White recreationists to travel farther and more frequently to wildland parks and natural areas than African Americans [111]. Identifying how, when, and why different groups interact with nature will ensure that future studies follow equitable, community-based research practices. For too long, the histories, experiences, and cultural knowledge of the outdoors in communities of color have been devalued or omitted from environmental education and advocacy narratives [112]. In lieu of merely writing a prescription for outdoor activity, individuals without a childhood connection to nature may need additional support and programming for them to feel at ease in the outdoors [113].
Providers currently do not have a reliable mechanism for recording patient behavior or connecting individuals to outdoor amenities. Social prescription software may solve this in the future. Such software will help providers easily identify nearby natural resources, such as parks and gardens, that fit the interests, aptitudes, and schedules of patients and their families. Furthermore, using location services via cellular data can help monitor uptake and completion of the social prescription. As nature-based social prescribing programs expand and develop nationwide, technological innovation through digital applications may assist with the adoption and integration of prescribing into everyday medical care.
There is an emerging evidence base suggesting that nature-based social prescribing and other related referral schemes providing promising avenues to promote social connection as an antidote to social isolation and loneliness. However, the field could benefit from more quantitative investigations that employ experimental study designs [38, 46, 77, 114] with larger sample sizes [24•], use valid and reliable outcome measures, include control groups, and use inferential statistics [38]. Moreover, there is a need to evaluate the range of interventions across different demographic and social groups to understand the uptake of the intervention by high-risk populations [115]. Investing in robust pragmatic research and evaluation will move the SP field forward by strengthening the evidence base for affordable, sustainable, and scalable interventions that can counter mounting environmental stressors, housing and job insecurities and safety by promoting social connection and over the longer term, mental well-being and population health.
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Leavell, M.A., Leiferman, J.A., Gascon, M. et al. Nature-Based Social Prescribing in Urban Settings to Improve Social Connectedness and Mental Well-being: a Review. Curr Envir Health Rpt 6, 297–308 (2019). https://doi.org/10.1007/s40572-019-00251-7
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DOI: https://doi.org/10.1007/s40572-019-00251-7