[1] McMaster Univ, Dept Med, Hamilton, ON, Canada
[2] Queens Univ, Sch Med, Kingston, ON, Canada
[3] Hamilton Hlth Sci, Emergency Dept, Hamilton, ON, Canada
[4] McMaster Univ, Dept Med, Div Emergency Med, Hamilton, ON, Canada
[5] McMaster Univ, Hlth Res Methodol Evidence & Impact HEI, Hamilton, ON, Canada
[6] Queens Univ, Emergency Med, Kingston, ON, Canada
[7] Ottawa Hosp, Dept Psychiat, Ottawa, ON, Canada
[8] Ottawa Hosp, Dept Obstet & Gynecol, Ottawa, ON, Canada
[9] Univ Ottawa, Dept Obstet & Gynecol, Ottawa, ON, Canada
[10] Univ Toronto, Toronto, ON, Canada
[11] McMaster Univ, Michael G DeGroote Sch Med, Hamilton, ON, Canada
[12] Univ Laval, Dept Anesthesiol & Crit Care Med, Fac Med, Quebec City, PQ, Canada
[13] Ctr Integre Sante & Serv Sociaux Chaudiere Appala, Levis, PQ, Canada
[14] Univ Toronto, Dept Med, Div Emergency Med, Toronto, ON, Canada
[15] McMaster Univ, Dept Med, Div Educ & Innovat, Hamilton, ON, Canada