1. Department of Oral Pathology, School of Dentistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
2. TelessaúdeRS–Graduate Program in Epidemiology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
3. Graduate Program in Dentistry, School of Dentistry, Universidade Luterana do Brasil (ULBRA), Canoas, Brazil.
4. Centro de Especialidades Odontológicas/Estomatologia, Prefeitura Municipal de Porto Alegre, Porto Alegre, Brazil.