1. Department of Health and Society, University of Toronto Scarborough, Toronto, Ontario, Canada
2. Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Ontario, Canada
3. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
4. Centre for Clinical Epidemiology and Evaluation, University of British Columbia, Vancouver, British Columbia, Canada
5. Department of Medicine, Section of Epidemiology and Population Sciences, Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, USA