1. Department of Medicine and Surgery, University of Enna “Kore”, 94100 Enna, Italy
2. Department of Medical, Surgical Sciences and Advanced Technologies “GF Ingrassia” ENT Section, University of Catania, 95123 Catania, Italy
3. Otorhinolaryngology Department, Sapienza University of Rome, Policlinico Umberto I, Viale del Policlinico, 00161 Rome, Italy
4. ASP Ragusa-Hospital Giovanni Paolo II, 97100 Ragusa, Italy
5. Radiology Unit, IRCCS San Raffaele Scientific Institute, Via Olgettina 60, 20132 Milan, Italy
6. Department of Anesthesia and Intensive Care, Azienda Ospedaliero Universitaria Policlinico “G. Rodolico–San Marco”, 95123 Catania, Italy