1. Department of General Surgery and Surgical-Medical Specialties, School of Dentistry, University of Catania, Via S. Sofia 78, 95124 Catania, Italy
2. Health Direction of Policlinic Hospital, 95100 Catania, Italy
3. Chief Medical Officer of the University Hospital “G. Rodolico-San Marco”, University of Catania, Via S. Sofia 78, 95124 Catania, Italy