1. Postgraduate Studies Program in Dentistry; Faculty of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil
2. Department of Preventive and Social Dentistry; Faculty of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil
3. Postgraduate Studies Program in Dentistry; Piracicaba Dental School; University of Campinas; Piracicaba Brazil
4. Department of Community Dental Health; Piracicaba Dental School; University of Campinas; Piracicaba Brazil