1 Department of Clinical and Preventive Dentistry, Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil.
2 Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
3 Department of Stomatology, A. C. Camargo Cancer Center, São Paulo, São Paulo, Brazil.
4 Department of Clinical and Preventive Dentistry, Universidade Federal de Pernambuco (UFPE), Recife, Pernambuco, Brazil; Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil. Electronic address: danyel.perez@ufpe.br.