Cook Deborah J, Crowther Mark A, Douketis Jim, Meade Maureen O, Rocker Graeme M, Martin Claudio M, Geerts William H
Deparment of Medicine, McMaster University, Hamilton, Ontario, Canada L8N 3Z5.
J Crit Care. 2005 Dec;20(4):330-3. doi: 10.1016/j.jcrc.2005.09.006.