1. Department of Oral Diagnosis and Pathology, School of Dentistry Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
2. Department of Oral and Maxillofacial Surgery and Pathology, School of Dentistry Universidade de Pernambuco Recife Pernambuco Brazil
3. Department of Oral Diagnosis, Piracicaba Dental School Universidade Estadual de Campinas Piracicaba São Paulo Brazil
4. Pathology Section Centro Clínico de Cabeza y Cuello/Hospital Herrera Llerandi Guatemala City Guatemala