1. Otolaryngology Service, Head and Neck Department, San Raffaele Hospital, Vita-Salute University, Milan, Italy;
2. Head and Neck Oncology Service, IRCCS FPO Candiolo Cancer Institute Turin, Italy;
3. Otolaryngology Service, Vittorio Veneto Hospital, Treviso, Italy;
4. Otolaryngology Service, Oncology Department, San Luigi Gonzaga Hospital, University of Turin, Italy