1 Service of Oral Pathology, João de Barros Barreto University Hospital, Federal University of Pará, Belém, Pará, Brazil; Oral Diagnosis Department, Semiology and Oral Pathology Areas, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil. Electronic address: Harp@ufpa.br.
2 Service of Oral Pathology, João de Barros Barreto University Hospital, Federal University of Pará, Belém, Pará, Brazil.
3 Oral Diagnosis Department, Semiology and Oral Pathology Areas, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
4 Service of Oral Pathology, João de Barros Barreto University Hospital, Federal University of Pará, Belém, Pará, Brazil; Dental Private Clinic, Belém, Pará, Brazil.
5 The School of Clinical Dentistry, Sheffield, UK.
6 Department of Oral Surgery and Pathology, School of Dentistry, Federal University of Minas Gerais (UFMG), 31270-901, Belo Horizonte, Minas Gerais, Brazil.