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Shim JK, Chun DH, Choi YS, Lee JY, Hong SW, Kwak YL.Shim JK, et al. Among authors: choi ys.Crit Care Med. 2009 Feb;37(2):539-44. doi: 10.1097/CCM.0b013e3181954403.Crit Care Med. 2009.PMID: 19114907Clinical Trial.