1. ENT, Audiology and Phoniatric Unit, Department of Neurosciences, University of Pisa, Italy;
2. Department of Diagnostic and Interventional Radiology, University of Pisa, Italy;
3. Regional Centre of Nuclear Medicine, Azienda Ospedaliera Universitaria Pisana, Pisa, Italy;
4. Audiology and Phoniatric Unit, University of Napoli 2, Italy;
5. Institute of Clinical Physiology of the Italian National Research Council (IFC-CNR), Pisa, Italy