1. Postgraduate Program in Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil
2. Postgraduate Program in Epidemiology; Federal University of Rio Grande do Sul; Porto Alegre Brazil
3. Department of Dental Materials and Prosthetics; University of São Paulo; Ribeirão Preto Brazil
4. Division of Oral Health and Society; McGill University; Montreal Québec Canada
5. Department of Public Health; Federal University of Health Sciences of Porto Alegre; Porto Alegre Brazil