[1] Univ Ottawa, Ottawa Hosp Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
[2] Univ Laval, Populat Hlth & Optimal Hlth Pract Res Unit Trauma, CHU Quebec, Res Ctr, Quebec City, PQ, Canada
[3] Univ Laval, Dept Anesthesiol & Crit Care Med, Quebec City, PQ, Canada
[4] Univ Ottawa, Sch Epidemiol & Publ Hlth, Ottawa, ON, Canada
[5] Ottawa Hosp, Dept Med, Ottawa, ON, Canada
[6] Ottawa Hosp, Ottawa, ON, Canada
[7] Univ Ottawa, Fac Med, Ottawa, ON, Canada
[8] Ottawa Hosp, Dept Anesthesiol & Pain Med, Ottawa, ON, Canada