Institution: | 1. Department of Head and Neck Surgery, University of S?o Paulo Medical School, S?o Paulo, Brazil;2. Department of Surgery, Albert Einstein Jewish Hospital, S?o Paulo, BrazilAlameda Franca, 267, Room 21, CEP 01422‐000, S?o Paulo, Brazil.;3. Department of Head and Neck Surgery, Federal University of S?o Paulo, S?o Paulo, Brazil;4. Department of Surgery, Albert Einstein Jewish Hospital, S?o Paulo, Brazil;5. Department of Neurology, State University of Campinas, Campinas, Brazil.;6. Department of Gastroenterology, State University of Campinas, Campinas, Brazil. |