1. Department of Medical and Surgical Pathology, Otorhinolaryngology Section, Pisa University Hospital, 56024 Pisa, Italy
2. Department of Surgical Sciences, University of Turin, 10024 Turin, Italy
3. Department of Biomedical Sciences, University of Cagliari, 09121 Cagliari, Italy
4. Department of Surgical Sciences, University of Cagliari, 09121 Cagliari, Italy