1. Department of Medical and Surgical Sciences and Advanced Technologies “GF Ingrassia”, ENT Section, University of Catania, 95100 Catania, Italy
2. Department of General Surgery and Surgical-Medical Specialties, School of Dentistry, University of Catania, 95124 Catania, Italy
3. Department of General Surgery, Section of Maxillo Facial Surgery of Polyclinic “G. Rodolico-San Marco” University Hospital, University of Catania, 95100 Catania, Italy