1. Department of Environmental Health, and
2. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
3. VA Boston Healthcare System, Boston, Massachusetts, USA
4. School of Public Health, and
5. School of Medicine, Boston University, Boston, Massachusetts, USA
6. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
7. Mailman School of Public Health, Columbia University, New York, New York, USA