1. Department of Pediatrics and
2. Keenan Research Centre, Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Ontario, Canada;
3. Division of Pediatric Medicine and the Pediatric Outcomes Research Team,
4. Child Health Evaluative Sciences, Hospital for Sick Children Research Institute, Toronto, Ontario, Canada;
5. Departments of Health Policy Management and Evaluation,
6. Division of Pediatric Emergency Medicine, and
7. Medicine, University of Toronto, Toronto, Ontario, Canada; and
8. Departments of Emergency Medicine and Pediatrics, University of California, Davis School of Medicine, Davis, California
9. Hospital Library, Hospital for Sick Children, Toronto, Ontario, Canada;
10. Pediatrics, and