1. Department of Otorhinolaryngology, Head & Neck Surgery, State University of Campinas (UNICAMP), P.O. Box 6111, 13081-970 Campinas, SP, Brazil
2. Department of Ear, Nose, Throat and Head & Neck Surgery, Unicamp, Brazil
3. Department of Pathology, Unicamp, Brazil
4. ENT, Maxillo Facial, Maxilo Facial ENT Service, Unicamp, Brazil