1. Department GF Ingrassia, ENT Section, University of Catania, Catania, Italy
2. Thoracic Surgery, Department of Surgery and Medical Specialties, Policlinico University Hospital, University of Catania, Catania, Italy
3. ENT Department, G.B. Morgagni Foundation, Catania, Italy
4. Department of Neurosciences, Section of Otolaryngology and Regional Centre for Head and Neck Cancer, University of Padova, Treviso, Italy
5. Department of Surgery, Oncology and Gastroenterology, Section of Oncology and Immunology, University of Padova, Padova, Italy