[1] Unity Hlth Toronto, Toronto, ON, Canada
[2] North York Gen Hosp, N York, ON, Canada
[3] Univ Toronto, Temerty Fac Med, Toronto, ON, Canada
[4] IWK Hlth, Halifax, NS, Canada
[5] Dalhousie Univ, Fac Med, Dept Emergency Med, Halifax, NS, Canada
[6] Sunnybrook Hlth Sci Ctr, Toronto, ON, Canada
[7] Sunnybrook Res Inst, Toronto, ON, Canada
[8] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[9] Univ Toronto, Fac Med, Dept Paediat, Toronto, ON, Canada
[10] Hosp Sick Children SickKids, Div Paediat Emergency Med, Toronto, ON, Canada
[11] Univ Ottawa, Dept Pediat & Emergency Med, Ottawa, ON, Canada
[12] Childrens Hosp Eastern Ontario, CHEO Res Inst, Ottawa, ON, Canada
[13] Univ British Columbia, Fac Med, Dept Emergency Med, Vancouver, BC, Canada
[14] Mem Univ Newfoundland, Fac Med Disciplines Family Med & Emergency Med, Newfoundland Reg Hlth Ctr, Grand Falls Windsor, NF, Canada
[15] Univ Calgary, Cumming Sch Med, Dept Emergency Med, Calgary, AB, Canada
[16] Univ Hlth Network, Toronto, ON, Canada