1. Department of Oral Pathology School of Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
2. Department of Oral Diagnosis, Piracicaba Dental School University of Campinas Piracicaba SP Brazil
3. Head and Neck Surgery Department Hospital Santa RitaComplexo Hospitalar Santa Casa Porto Alegre Brazil
4. Experimental Pathology Unit Clinics Hospital of Porto AlegreFederal University of Rio Grande do Sul Porto Alegre Brazil
5. Department of Oral Surgery and Pathology School of Dentistry Federal University of Minas Gerais Belo Horizonte Brazil
6. Department of Oral Pathology School of Dentistry Federal University of Bahia Salvador Brazil
7. Department of Oral Medicine Porto Alegre Clinics Hospital (HCPA/UFRGS) Porto Alegre Brazil