1. Unit of Otolaryngology, Head and Neck Department, AOUI University of Verona, 37100 Verona, Italy
2. Unit of Maxillo-Facial Surgery, Head and Neck Department, AOUI University of Verona, 37100 Verona, Italy
3. Unit of Epidemiology and Medical Statics, Department of Diagnostics and Public Health, AOUI University of Verona, 37100 Verona, Italy