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