1. Ottawa Hospital Research Institute, Clinical Epidemiology Program, Ottawa, Ontario, Canada
2. School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ontario, Canada
3. Public Health Ontario, Toronto, Ontario, Canada
4. Dalla Lana School of Public Health, University of Toronto, Ontario, Canada
5. Children's Hospital of Eastern Ontario, Division of Gastroenterology, Ottawa, Ontario, Canada
6. Departments of Pediatrics & Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
7. Canadian Centre for Vaccinology, IWK Health Centre, Halifax, Nova Scotia, Canada
8. Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
9. Centre for Immunization and Respiratory Infectious Diseases, Public Health Agency of Canada, Ottawa, Ontario, Canada
10. British Columbia Centre for Disease Control, School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
11. Chief Public Health Office, Charlottetown, Prince Edward Island, Canada
12. Vaccine and Drug Evaluation Centre, Community Health Sciences, University of Manitoba, Winnipeg, MB, Canada