1 Department of Paediatrics (Lee), University of Toronto and Mount Sinai Hospital; MiCare Research Centre, Department of Pediatrics (Mahl), Mount Sinai Hospital, Toronto, Ont.; Department of Emergency Medicine (Rowe), Faculty of Medicine & Dentistry and School of Public Health; College of Health Sciences, University of Alberta, Edmonton, Alta.; Faculty of Health (Lexchin), York University; Emergency Department (Lexchin), University Health Network; Faculty of Medicine (Lexchin), University of Toronto, Toronto, Ont. shoo.lee@sinaihealth.ca.
2 Department of Paediatrics (Lee), University of Toronto and Mount Sinai Hospital; MiCare Research Centre, Department of Pediatrics (Mahl), Mount Sinai Hospital, Toronto, Ont.; Department of Emergency Medicine (Rowe), Faculty of Medicine & Dentistry and School of Public Health; College of Health Sciences, University of Alberta, Edmonton, Alta.; Faculty of Health (Lexchin), York University; Emergency Department (Lexchin), University Health Network; Faculty of Medicine (Lexchin), University of Toronto, Toronto, Ont.