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Cook, D., Heyland, D. & Marshall for the Canadian Critical Care Trials Group, J. On the need for observational studies to design and interpret randomized trials in ICU patients: a case study in stress ulcer prophylaxis. Intensive Care Med 27, 347–354 (2001). https://doi.org/10.1007/s001340000828
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DOI: https://doi.org/10.1007/s001340000828