1. Department of Emergency Medicine University of Alberta Edmonton Alberta
2. School of Public Health University of Alberta Edmonton Alberta
3. Alberta Research Centre for Health Evidence University of Alberta Edmonton Alberta
4. J.W. Scott Health Sciences Library University of Alberta Walter C. Mackenzie Health Sciences Centre Edmonton Alberta
5. Department of Pediatrics University of Alberta Edmonton Clinic Health Academy Edmonton Alberta
6. Departments of Pediatrics and of Social and Preventive Medicine University of Montreal Montreal Quebec Canada