1. Ottawa Hospital Research Institute, Clinical Epidemiology Program, Ottawa, Ontario, Canada
2. ICES, University of Ottawa, Ottawa, Ontario, Canada
3. Department of Obstetrics and Gynecology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
4. Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
5. School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada
6. Ottawa Victim Services, Ottawa, Ontario, Canada
7. Department of Emergency Medicine, Faculty of Medicine, The Ottawa Hospital and University of Ottawa, Ottawa, Ontario, Canada