[1] Kingston Gen Hosp, Dept Med, Kingston, ON K7L 2V7, Canada
[2] Kingston Gen Hosp, Dept Nursing, Kingston, ON K7L 2V7, Canada
[3] Queens Univ, Dept Community Hlth & Epidemiol, Kingston, ON, Canada
[4] Queen Elizabeth 2 Hlth Sci Ctr, Dept Med, Halifax, NS, Canada
[5] St Pauls Hosp, Program Crit Care Med, Vancouver, BC V6Z 1Y6, Canada
[6] St Pauls Hosp, Ctr Hlth Evaluat & Outcome Sci, Vancouver, BC V6Z 1Y6, Canada
[7] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[8] Univ Alberta, Dept Publ Hlth Sci, Edmonton, AB, Canada
[9] Univ Alberta, Div Crit Care Med, Edmonton, AB, Canada
[10] Royal Alexandra Hosp, Edmonton, AB, Canada
[11] McMaster Univ, Dept Med, Hamilton, ON, Canada
[12] McMaster Univ, Dept Clin Epidemiol, Hamilton, ON, Canada
[13] Hlth Corp St Johns, Crit Care Program, St John, NF, Canada