Affiliation: | 1. Social Medicine Department, Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil;2. Takemi Program in International Health, Department of Global Health and Population, Harvard School of Public Health, Boston, Massachusetts;3. Municipal Health Department of Bento Gon?alves, Rio Grande do Sul, Brazil;4. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts |