Affiliation: | 1. Faculty of Medicine & Dentistry, Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada;2. Department of Public Health Sciences, School of Public Health, University of Alberta, Edmonton, Alberta, Canada;3. Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada;4. Faculty of Medicine & Dentistry, Department of Emergency Medicine, University of Alberta, Edmonton, Alberta, Canada |