1. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health , Baltimore, MD 21205 , USA
2. Graduate Program in Medical Sciences, Endocrinology, Department of Internal Medicine, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, RS 90035-003 , Brazil
3. Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre, RS 90035-003 , Brazil
4. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health , Baltimore, MD 21205 , USA
5. Seattle Epidemiologic Research and Information Center, VA Puget Sound Health Care System, Seattle , WA 98108 , USA
6. Division of Endocrinology and Metabolism, Hospital de Clínicas de Porto Alegre (HCPA) , Porto Alegre, RS 90035-003 , Brazil