1. Departments of Obstetrics and Gynaecology, Dalhousie University, Halifax, Nova Scotia, Canada
2. Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
3. Department of Paediatrics and Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
4. Division of Gastroenterology, Hepatology and Nutrition and Child Health Evaluative Sciences, SickKids Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
5. ICES, Toronto, Ontario, Canada
6. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
7. Public Health Ontario, Toronto, Ontario, Canada
8. Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
9. Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore
10. Better Outcomes Registry & Network, Ottawa, Ontario, Canada
11. Children’s Hospital of Eastern Ontario (CHEO) Research Institute, Ottawa, Ontario, Canada
12. School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada
13. Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
14. Ottawa Hospital Research Institute, Ottawa, Ontario, Canada