1. Department of Otolaryngology and Head and Neck Surgery, Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, Milan, Italy;
2. Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Milan, Italy;
3. Department of Otorhinolaryngology, University of Pavia, IRCCS Policlinico San Matteo Foundation, Pavia, Italy;
4. Department of Clinical Sciences and Community Health, Università degli Studi di Milano Ospedale Fatebenefratelli San Giuseppe, Milano;
5. Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy