1. Oral Pathology Section; Department of Oral Diagnosis; Piracicaba Dental School; University of Campinas/UNICAMP; Piracicaba Brazil
2. Pathology Division; Centro Clínico de Cabeza y Cuello/Hospital Herrera Llerandi; Guatemala City Guatemala
3. Pathology Laboratory; Guatemala City Guatemala
4. Oral Pathology Section; Department of Oral Diagnosis and Pathology; School of Dentistry; Federal University of Rio de Janeiro (UFRJ); Rio de Janeiro Brazil