1. Department of Oral Diagnosis; Piracicaba Dental School; University of Campinas; Piracicaba Brazil
2. Department of Pathology; School of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil
3. Service of Buccal Pathology; João de Barros Barreto University Hospital; Federal University of Pará; Belém Brazil
4. Department of Oral Medicine; Sírio-Libanês Hospital; São Paulo Brazil