1 Public Health Ontario, Toronto, ON M5G 1V2, Canada; Institute for Clinical Evaluative Sciences, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada. Electronic address: [email protected].
2 Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada; Institute for Health and Social Policy, McGill University, Montreal, QC, Canada.
3 Department of Family Medicine and Public Health and Scripps Institution of Oceanography, University of California, San Diego, CA, USA.