1. Oral Diagnosis Department, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Brazil
2. Department of Oral Pathology, School of Dentistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
3. Department of Oral Medicine, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
4. Department of Pathology, Faculty of Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil