[1] Univ Saskatchewan, Dept Emergency Med, Saskatoon, SK, Canada
[2] Univ Saskatchewan, Coll Med, Saskatoon, SK, Canada
[3] Univ Calif Los Angeles, Los Angeles Cty Harbor, Los Angeles Med Ctr, Los Angeles, CA USA
[4] Univ Leicester, SAAPHIRE Grp, Leicester, Leics, England
[5] Leicester Royal Infirm, Paediat Emergency Med, Leicester, Leics, England
[6] Footscray Hosp, Emergency Med, Melbourne, Vic, Australia
[7] Univ Melbourne, Melbourne, Vic, Australia
[8] McMaster Univ, Div Emergency Med, Dept Med, Hamilton, ON, Canada
[9] McMaster Program Educ Res Innovat & Theory MERIT, Hamilton, ON, Canada
[10] Univ Cape Town, Div Emergency Med, Cape Town, South Africa
[11] Univ Southern Calif, Keck Sch Med, Clin Emergency Med, Los Angeles, CA 90007 USA