[1] McMaster Univ, St Josephs Healthcare Hamilton, Div Crit Care, Dept Med, 50 Charlton Ave, Hamilton, ON L8N 4A6, Canada
[2] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada
[3] Rigshosp, Copenhagen Univ Hosp, Dept Intens Care 4131, Copenhagen, Denmark
[4] NYU, Sch Med, Div Pulm Crit Care & Sleep Med, New York, NY USA
[5] Boston Univ, Sch Med, Dept Med, Boston, MA 02118 USA
[6] Amer Coll Chest Phys CHEST, Glenview, IL USA
[7] Emory Univ, Dept Surg, Atlanta, GA 30322 USA
[8] Emory Univ, Emory Crit Care Ctr, Atlanta, GA 30322 USA
[9] Humanitas Clin & Res Ctr, Milan, Italy
[10] Humanitas Univ, Dept Biomed Sci, Milan, Italy
[11] Amer Univ Beirut, Dept Internal Med, Beirut, Lebanon