1. Department of Community Health Sciences, UCLA Fielding School of Public Health, 650 Charles E. Young Drive South, 26-070 CHS, Los Angeles, CA 90095-1772, USA
2. Population Studies Center (NEPO), University of Campinas (UNICAMP), Cidade Universitaria Zeferino Vaz., Avenida Albert Einstein 1300, Caixa Postal 6166, 13081-970 Campinas, SP, Brazil
3. Epidemiology Program, National School of Public Health, Oswaldo Cruz Foundation (FIOCRUZ), Rua Leopoldo Bulhões 1480, 21041-210, Rio de Janeiro, RJ, Brazil