1. Faculty of Medicine, University of Ottawa, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
2. Health Canada, Ottawa, Ontario, Canada
3. Air Health Science Division, Water, Air, and Climate Change Bureau, Ottawa, Ontario, Canada
4. Biostatistics and Epidemiology Division, Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario, Canada
5. Immunization and Respiratory Infections Division, Public Health Agency of Canada, Ottawa, Ontario, Canada