1 Departments of Pediatrics and Emergency Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
2 Department of Pediatrics and Emergency Medicine, University of Ottawa, Ottawa, Ontario, Canada.
3 Division of Pediatric Emergency Medicine, Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada.
4 Departments of Pediatrics and Emergency Medicine, University of Alberta, Women's and Children's Health Research Institute, Alberta, Canada.
5 Department of Pediatric Emergency Medicine, Max Rady School of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada.
6 Department of Pediatrics and Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada.
7 Department of Emergency Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
8 Division of Pediatric Emergency Medicine, Department of Pediatrics, The Hospital for SickKids Research Institute, University of Toronto, Toronto, Ontario, Canada.
9 Departments of Pediatrics, Emergency Medicine, and Physiology & Pharmacology, Cumming School of Medicine, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Onbtario, Canada.