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Fan E, Ciesla ND, Truong AD, Bhoopathi V, Zeger SL, Needham DM.Fan E, et al. Among authors: zeger sl.Intensive Care Med. 2010 Jun;36(6):1038-43. doi: 10.1007/s00134-010-1796-6. Epub 2010 Mar 6.Intensive Care Med. 2010.PMID: 20213068Free PMC article.