1. Department of Community Dentistry; Piracicaba Dental School; University of Campinas; Piracicaba SP Brazil
2. Department of Pediatric Dentistry and Community Health; Maurice H. Kornberg School of Dentistry; Temple University; Philadelphia Pennsylvania
3. Department of Preventive and Social Dentistry; Faculty of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre RS Brazil
4. Center of Social Dentistry Research; Federal University of Rio Grande do Sul; Porto Alegre RS Brazil