1. Department of Oral Pathology, School of Dentistry Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
2. Department of Oral Diagnosis, Piracicaba School of Dentistry Universidade Estadual de Campinas Piracicaba Brazil
3. Molecular Pathology Area, School of Dentistry Universidad de la República (UDELAR) Montevideo Uruguay
4. Department of Oral Medicine Hospital de Clínicas de Porto Alegre Porto Alegre Brazil
5. Head and Neck Surgery Department, Hospital Santa Rita Complexo Hospitalar Santa Casa Porto Alegre Brazil
6. Pathology Department, Hospital Santa Rita, Complexo Hospitalar Santa Casa Porto Alegre Brazil
7. Academic Unit of Oral and Maxillofacial Medicine and Pathology, Department of Clinical Dentistry University of Sheffield Sheffield UK