1. Section of Otolaryngology, Department of Basic Medical Science, Neuroscience and Sensory Organs, University of Bari, Italy;
2. U.O.C. of Otolaryngology, Ospedale Di Venere, Carbonara di Bari (BA), Italy;
3. ORL-Asp 6- Palermo, Italy;
4. Section of Otolaryngology, Azienda Area Vasta Romagna-Riccione, Italy;
5. Section of Otolaryngology, ASL BR1 Brindisi, Italy;
6. Section of Otolaryngology, ASP of Agrigento, Italy;
7. ORL Clinic University of Insubriae, Varese, Italy;
8. U.O.C. of Otolaryngology Hospital Maggiore of Bologna, Italy;
9. Department of Sensory Organs, Sapienza University of Roma, Italy;
10. Otorhinolaryngology, Fondazione Policlinico A. Gemelli, Università Cattolica del Sacro Cuore, Rome, Italy;
11. Department of Medicine, Istituto di Ricovero e Cura a Carattere Scientifico (I.R.C.C.S.), Azienda Ospedaliera Universitaria San Martino, Genoa, Italy