1. Divisions of Pediatric Emergency Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada;
2. Children’s Hospital of Eastern Ontario (CHEO), Ottawa, Ontario, Canada;
3. Izaak Walton Killam Health Centre, Halifax, Nova Scotia, Canada;
4. Janeway Children’s Hospital, St John’s, Newfoundland and Labrador, Canada;
5. cho Sainte-Justine, Montreal, Quebec, Canada;
6. McMaster University, Hamilton, Ontario, Canada; and
7. Alberta Children’s Hospital, Calgary, Alberta, Canada