University of British Columbia (UBC) - Pediatrics Department, University of British Columbia (UBC) - Pediatrics Department, British Columbia Children's Hospital Research Institute, British Columbia Children's Hospital Research Institute - Vaccine Evaluation Center, British Columbia Children's Hospital Research Institute - Vaccine Evaluation Center, University of British Columbia (UBC) - Pediatrics Department, University of British Columbia (UBC) - Pediatrics Department, British Columbia Children's Hospital Research Institute, British Columbia Centre for Disease Control, British Columbia Centre for Disease Control and British Columbia Children's Hospital Research Institute

affiliation not provided to SSRN, British Columbia Centre for Disease Control, University of Manitoba - Manitoba Centre for Health Policy, Aga Khan University, University of Manitoba - Manitoba Centre for Health Policy, University of Manitoba - Max Rady College of Medicine, Public Health Agency of Canada and Université Laval - Faculty of Medicine