[1] Univ New South Wales, George Inst Global Hlth, Sydney, NSW, Australia
[2] Imperial Coll, Sch Publ Hlth, London, England
[3] McMaster Univ, Dept Med, Hamilton, ON, Canada
[4] McMaster Univ, Dept Clin Epidemiol & Biostatist, Hamilton, ON, Canada
[5] Univ Fed Sao Paulo, Dept Anesthesiol Pain & Intens Care, Sao Paulo, Brazil
[6] Univ Copenhagen, Dept Intens Care, Rigshosp, Copenhagen, Denmark