1. Department of Medico-surgical sciences and biotechnologies, ENT Section, Sapienza University of Rome, Italy;
2. Department of Biomedical, Surgical and Dental Sciences, Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, Università degli Studi di Milano, Milan, Italy;
3. Department of Otorhinolaryngology, University of Pavia, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy;
4. Department of Otorhinolaryngology, Fatebenefratelli Hospital, Roma, Italy;
5. Department of Sense Organs, ENT Section, Policlinico Umberto I, Sapienza University of Rome, Italy;
6. Department of Experimental, Diagnostic and Specialty Medicine, Dimes, Bologna University Medical School, Ear, Nose and Throat Unit of SantOrsola-Malpighi Hospital, Bologna, Italy;
7. Department of Clinical Sciences and Community Health, Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, Università degli Studi di Milano, Milan, Italy;
8. Department Experimental biomedicine and clinical neurosciences, Otorhinolaryngology Unit, University of Palermo; Italy;
9. Department of Clinical Sciences and Community Health, San Giuseppe Hospital, Università degli Studi di Milano, Milan, Italy;
10. Department of Head and Neck Surgery, Institute of Otorhinolaryngology, Università Cattolica del Sacro Cuore, Italy;
11. Ear, Nose and Throat Metropolitan Unit, Surgical Department, AUSL Bologna, Italy;
12. Department of Otorhinolaryngology, AOU, PO S. Giovanni di Dio, University of Cagliari, Italy