1. International Research Center; A.C. Camargo Cancer Center; São Paulo SP Brazil
2. Department of Anatomic Pathology; A.C. Camargo Cancer Center; São Paulo SP Brazil
3. Department of General Pathology; Dental School; University of São Paulo; São Paulo SP Brazil
4. Department of Head and Neck Surgery and Otorhinolaryngology; AC Camargo Cancer Center; São Paulo SP Brazil