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Duffy MJ, Mullan BA, Craig TR, Shyamsundar M, MacSweeney RE, Thompson G, Stevenson M, McAuley DF.Duffy MJ, et al.Crit Care Med. 2011 Apr;39(4):629-35. doi: 10.1097/CCM.0b013e318206bc4a.Crit Care Med. 2011.PMID: 21242802