2 Department GF Ingrassia, University of Catania, Catania, Italy.
3 Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy.
4 Otolaryngology Unit, AORN Cardarelli, Naples, Italy.
5 Unit of Audiology, Department of Experimental and Clinical Medicine, Regional Centre for Cochlear Implants and ENT Diseases, Magna Graecia University, Catanzaro, Italy.