title: Why?
authors: Department of Critical Care, University of Calgary, Calgary, Alberta T2W 3N2, Canada.
authors: J Dean
authors: JD
authors: Sandham
mesh_terms: D016022:Case-Control Studies; D002407:Catheterization, Swan-Ganz / Q000401:mortality*; D006801:Humans; D007362:Intensive Care Units; D015201:Meta-Analysis as Topic; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D012189:Retrospective Studies; D012307:Risk Factors