[1] McMaster Univ, Dept Med, Hamilton, ON, Canada
[2] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada
[3] Univ Ottawa, Dept Pediat, Ottawa, ON, Canada
[4] Jagiellonian Univ, Med Coll, Dept Intens Care & Perioperat Med, Krakow, Poland
[5] Univ Ottawa, Dept Med Crit Care, Ottawa, ON, Canada
[6] Ottawa Hosp, Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
[7] Univ Hosp Geneva, Div Gen Internal Med, Geneva, Switzerland
[8] Univ Hosp Geneva, Div Clin Epidemiol, Geneva, Switzerland
[9] CHU Sherbrooke, Ctr Rech, Sherbrooke, PQ, Canada
[10] Univ Sherbrooke, Fac Med & Sci Sante, Sherbrooke, PQ, Canada
[11] Emory Univ, Dept Med, Div Pulm Allergy & Crit Care, Atlanta, GA 30322 USA
[12] Innlandet Hosp, Trust Div, Dept Med, Gjovik, Norway
[13] Univ Queensland, Wesley Hosp, Dept Intens Care, St Lucia, Qld, Australia
[14] Univ Queensland, Princess Alexandra Hosp, St Lucia, Qld, Australia
[15] Univ Sydney, Sydney, NSW, Australia
[16] Univ Versailles, Hop Raymond Poincare, Lab Infect & Inflammat, Garches, France