1. Department of Experimental, Diagnostic and Specialty Medicine, Dimes, Bologna University Medical School, Ear, Nose and Throat Unit of “Sant’Orsola-Malpighi” Hospital, Bologna, Italy;
2. Ear, Nose and Throat Unit of “Sant’Orsola-Malpighi” Hospital, Bologna, Italy;
3. Ear, Nose and Throat Metropolitan Unit, Surgical Department, AUSL Bologna, Italy