1. Graduate Program in Dentistry, Federal University of Pelotas, Pelotas-RS, Brazil
2. Department of Dentistry, Radboud University Medical Center, Nijmegen, the Netherlands
3. School of Dentistry, IMED Faculdade Meridional, Passo Fundo-RS, Brazil
4. Department of Preventive and Community Dentistry, Federal University of Rio Grande do Sul, Porto Alegre-RS, Brazil