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Helfaer MA, McColley SA, Pyzik PL, Tunkel DE, Nichols DG, Baroody FM, April MM, Maxwell LG, Loughlin GM.Helfaer MA, et al. Among authors: nichols dg.Crit Care Med. 1996 Aug;24(8):1323-7. doi: 10.1097/00003246-199608000-00009.Crit Care Med. 1996.PMID: 8706486Clinical Trial.