[1] Womens Coll Hosp, Inst Hlth Syst Solut & Virtual Care, 76 Grenville St, Toronto, ON M5S 1B2, Canada
[2] Sunnybrook Hlth Sci Ctr, Dept Emergency Serv, Toronto, ON, Canada
[3] Univ Toronto, Temerty Fac Med, Div Emergency Med, Toronto, ON, Canada
[4] London Sch Hyg & Trop Med, Fac Publ Hlth & Policy, London, England
[5] North Thames Appl Res Collaborat, London, England