[1] Gemelli Isola, Otolaryngol Dept, Rome, Italy
[2] Univ Catania, Dept GF Ingrassia, Catania, Italy
[3] Univ Salerno, Dept Med Surg & Dent, Salerno, Italy
[4] AORN Cardarelli, Otolaryngol Unit, Naples, Italy
[5] Magna Graecia Univ Catanzaro, Reg Ctr Cochlear Implants & ENT Dis, Dept Expt & Clin Med, Unit Audiol, Catanzaro, Italy
[6] San Giovanni Addolorata Hosp, Otolaryngol Dept, Rome, Italy