[1] Univ Toronto, Div Emergency Med, Unity Hlth Toronto, Toronto, ON, Canada
[2] Univ Toronto, Interdept Div Crit Care, Unity Hlth Toronto, Toronto, ON, Canada
[3] Univ Toronto, Michael Garron Hosp, Dept Emergency Med, Div Family & Community Med, Toronto, ON, Canada
[4] Queens Univ, Dept Emergency Med, Kingston, ON, Canada