1. Department of Pediatrics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
2. Department of Pediatrics, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
3. Department of Emergency Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
4. Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
5. Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
6. Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
7. School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ottawa, Ontario, Canada
8. Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
9. Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
10. Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
11. Department of Pediatrics, the Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
12. Department of Pediatrics, IWK Health Centre, Dalhousie University, Halifax, Nova Scotia, Canada
13. Alberta Children’s Hospital, University of Calgary, Calgary, Alberta, Canada
14. Department of Pediatrics, Montreal Children’s Hospital, McGill University Health Centre, Montreal, Quebec, Canada
15. Department of Pediatrics, University of Minnesota Medical School, Minneapolis
16. Department of Emergency Medicine, University of Minnesota Medical School, Minneapolis