Institution: | 1. MSc, Postgraduate Program in Epidemiology, Medical School, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil;2. PhD Candidate, Postgraduate Program in Epidemiology, Medical School, UFRGS, Porto Alegre, RS, Brazil;3. PhD, Epidemiology. Professor, Postgraduate Program in Epidemiology, Medical School, UFRGS, Porto Alegre, RS, Brazil |