[1] Univ British Columbia, Dept Pediat & Emergency Med, Vancouver, BC, Canada
[2] Univ Ottawa, Dept Pediat & Emergency Med, Ottawa, ON, Canada
[3] McMaster Univ, Dept Pediat, Div Pediat Emergency Med, Hamilton, ON, Canada
[4] Univ Alberta, Womens & Childrens Hlth Res Inst, Dept Pediat & Emergency Med, Edmonton, AB, Canada
[5] Univ Manitoba, Max Rady Sch Med, Dept Pediat Emergency Med, Winnipeg, MB, Canada
[6] Western Univ, Schulich Sch Med & Dent, Dept Pediat & Med, London, ON, Canada
[7] Dalhousie Univ, Dept Emergency Med, Halifax, NS, Canada
[8] Univ Toronto, Hosp SickKids Res Inst, Dept Pediat, Div Pediat Emergency Med, Toronto, ON, Canada
[9] Univ Calgary, Alberta Childrens Hosp, Res Inst, Cumming Sch Med,Dept Pediat, Calgary, AB, Canada
[10] Univ Calgary, Alberta Childrens Hosp, Res Inst, Cumming Sch Med,Dept Emergency Med, Calgary, AB, Canada
[11] Univ Calgary, Alberta Childrens Hosp, Res Inst, Cumming Sch Med,Dept Physiol & Pharmacol, Calgary, AB, Canada