1. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
2. Public Health Ontario, Toronto, Ontario, Canada
3. Population Studies Division, Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario, Canada
4. ICES, Toronto, Ontario, Canada
5. Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
6. College of Public Health and Human Studies, Oregon State University, Corvallis, Oregon, USA
7. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
8. Air Quality Research Division, Environment Canada, Toronto, Ontario, Canada
9. Department of Medicine, McGill University, Montréal, Québec, Canada
10. Centre for Outcomes Research and Evaluation, Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
11. Department of Health Sciences, Carleton University, Ottawa, Ontario, Canada