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Goldman JM. A simple, easy and inexpensive method for monitoring ETCO2 through nasal cannulae (Letter). Anesthesiology 1987; 67: 606.
Zimmerman D, Loken RG. Modified nasal cannula to monitor ETCO2 (Letter). Can J Anaesth 1992; 39: 1119.
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Tsui, B.C.H. A simple method with no additional cost for monitoring ETCO2 using a standard nasal cannulae. Can J Anaesth 44, 787–788 (1997). https://doi.org/10.1007/BF03013403
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DOI: https://doi.org/10.1007/BF03013403