1. Department of Otorhinolaryngology, University of Turin, San Luigi Gonzaga Hospital, Orbassano, Italy
2. FPO IRCCS, Head & Neck Oncology Unit, Candiolo Cancer Institute, Turin, Italy
3. Department of Clinical and Biological Sciences, University of Turin, San Luigi Gonzaga Hospital, Orbassano, Italy
4. Department of Otorhinolaryngology, Galliera Hospital, Genova, Italy
5. Departement of Clinical and Biological Sciences, University of Turin, San Luigi Gonzaga Hospital, Orbassano, Italy