1. Air Health Science Division and
2. School of Epidemiology and Public Health
3. Institute for Clinical Evaluative Sciences, Ottawa, Ontario, Canada
4. Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
5. Department of Civil Engineering and
6. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
7. Harvard-Smithsonian Centre for Astrophysics, Cambridge, Massachusetts
8. Population Studies Division, Health Canada, Ottawa, Ontario, Canada
9. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
10. Public Health Ontario, Toronto, Ontario, Canada
11. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
12. Population Studies Division, Health Canada, Vancouver, British Columbia, Canada
13. Department of Public Health, Environments and Society and
14. Centre for Statistical Methodology, London School of Hygiene & Tropical Medicine, London, United Kingdom
15. Department of Geography, Environment and Geomatics, and
16. Better Outcomes Registry and Network Ontario, Ottawa, Ontario, Canada
17. Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Ontario, Canada
18. Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada; and
19. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada