1. Department of Oral Pathology; São Leopoldo Mandic Institute and Research Center; Campinas SP Brazil
2. Department of Oral Pathology; State University of São Paulo; Araçatuba SP Brazil
3. Department of Oral Pathology; Federal University of Minas Gerais; Belo Horizonte MG Brazil
4. Department of Anatomic Pathology; A.C. Camargo Cancer Center; São Paulo Brazil