1. ENT and Audiology Clinic, Department of Neurosciences and Rehabilitation, University Hospital of Ferrara, Ferrara, Italy
2. Department of Otology and Skull Base Surgery, Gruppo Otologico, Piacenza, Italy
3. Unit of Otorhinolaryngology, Head and Neck Department, University of Verona, Verona, Italy
4. Otolaryngology and Audiology Unit, University of Modena and Reggio Emilia, Modena, Italy