1. Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil
2. Department of Clinical and Social Dentistry, University of Paraíba (UFPB), João Pessoa, Paraíba, Brazil
3. Department of Statistics, Federal University of Paraíba (UFPB), João Pessoa, Paraíba, Brazil
4. Department of Social Medicine, School of Medicine, University of São Paulo, Ribeirão Preto, Brazil