1. ENT & Audiology Unit, Department of Neuroscience and Rehabilitation, University Hospital of Ferrara, Ferrara, Italy
2. ENT Department, I.R.C.C.S. Policlinico San Matteo-University of Pavia, Pavia PV, Italy
3. Department of Neuroscience, Institute of Otorhinolaryngology, University Hospital of Padova, Padova PD, Italy
4. Maxillo-Facial Unit, University Hospital of Ferrara, Ferrara, Italy
5. Head-Neck and Oral Surgery Unit, Morgagni Pierantoni Hospital, Azienda USL della Romagna, Forlì, Italy