1. ENT, Primary Care Department, ASL, Modena, Italy;
2. Center of Electron Microscopy, University of Ferrara, Ferrara, Italy;
3. Audiology Service, Modena and Reggio Emilia University, Bologna, Italy;
4. Department of Neurosciences, Reproductive and Odontostomatologic Sciences, University of Naples Federico II, Naples, Italy;
5. Institute of Otolaryngology, Department of Neurosciences, Padova University, Padova, Italy;
6. Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy