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Gordon SM, Jackson JC, Ely EW, Burger C, Hopkins RO.Gordon SM, et al. Among authors: hopkins ro.Intensive Care Med. 2004 Nov;30(11):1997-2008. doi: 10.1007/s00134-004-2418-y. Epub 2004 Oct 2.Intensive Care Med. 2004.PMID: 15549252Free PMC article.Review.