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