1. Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
2. Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Durham, North Carolina 27711, United States
3. Department of Civil and Mineral Engineering, University of Toronto, Toronto, Ontario M5S 1A4, Canada
4. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario M5T 3M7, Canada
5. Department of Laboratory Medicine and Pathobiology, Temerty Faculty of Medicine, University of Toronto, 1 King’s College Circle, Toronto, Ontario M5S 1A8, Canada
6. School of the Environment, University of Toronto, Toronto, Ontario M5S 3E8, Canada