[1] Western Univ, Div Crit Care Med, London, ON, Canada
[2] Univ British Columbia, Dept Emergency Med, Vancouver, BC, Canada
[3] Univ British Columbia, Ctr Hlth Evaluat & Outcome Sci, Vancouver, BC, Canada
[4] Dalhousie Univ, Dept Emergency Med, Halifax, NS, Canada
[5] Univ British Columbia, Div Cardiol, Vancouver, BC, Canada
[6] Univ Montreal, Montreal Heart Inst, Dept Cardiac Surg, Montreal, PQ, Canada
[7] Univ Alberta, Mazankowski Alberta Heart Inst, Div Cardiac Surg, Dept Crit Care Med & Surg, Edmonton, AB, Canada
[8] Western Univ, Div Cardiac Surg, London, ON, Canada