1. Department of Otorhinolaryngology Head and Neck Surgery, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Policlinico S. Orsola-Malpighi, 40138 Bologna, Italy
2. Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum, Università di Bologna, 40126 Bologna, Italy
3. Department of Otorhinolaryngology Head and Neck Surgery, University Hospital of Modena, 41125 Modena, Italy