1. Department of Oral Diagnosis; Piracicaba Dental School; State University of Campinas; Piracicaba São Paulo Brazil
2. Department of Pathology; Federal University of Santa Catarina; Florianopólis Santa Catarina Brazil
3. Department of Pathology; AC Camargo Cancer Centre; São Paulo São Paulo Brazil
4. Department of Head and Neck Surgery and Otorhinolaryngology; AC Camargo Cancer Centre; São Paulo São Paulo Brazil