1. Department of Environmental and Occupational Health, ESPUM, Université de Montréal, C.P. 6128, Succ. Centre–ville, Montreal, QC H3C 3J7, Canada.
2. Centre for Public Health Research (CReSP), Université de Montréal, C.P. 6128, Succ. Centre–ville, Montreal, QC H3C 3J7, Canada.