1. Epidemiology Postgraduation Program, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
2. Dermatology Department, Clinical Director's Office, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
3. Public Health Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
4. Primary Care Unit, Clinical Director's Office, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
5. Computer Science School, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
6. Medical Sciences Postgraduation Program, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
7. Outpatient Clinical Director's Office, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.