1. Otolaryngology, Mater Olbia Hospital, 07026 Olbia, Italy
2. U.O.C. Otorinolaringoiatria, Azienda Ospedaliero Universitaria di Sassari, Viale San Pietro, 43, 07100 Sassari, Italy
3. Otolaryngology Division, Department of Medicine, Surgery and Pharmacology, University of Sassari, Viale San Pietro, 43, 07100 Sassari, Italy
4. Unit of Otorhinolaryngology and Head-Neck Surgery, “A. Gemelli” Hospital Foundation IRCCS, 00168 Rome, Italy
5. Department of Head-Neck and Sensory Organs, Catholic University of Sacred Heart, 00168 Rome, Italy