1. Graduate Studies Program in Dentistry; Faculty of Dentistry; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
2. Graduate Studies Program in Epidemiology; Faculty of Medicine; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
3. Faculty of Dentistry; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
4. Department of Health and Human Communication; Institute of Psychology; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
5. Center of Community Dental Health Research; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
6. Department of Preventive and Social Dentistry; Faculty of Dentistry; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil