1. Department of Clinical and Experimental Medicine, University of Catania, 95124 Catania, Italy
2. Academic Unit of Internal Medicine, Cannizzaro Hospital, 95126 Catania, Italy
3. Nuclear Medicine Unit, Cannizzaro Hospital, 95126 Catania, Italy
4. Pathological Anatomy Unit, Cannizzaro Hospital, 95126 Catania, Italy
5. Endoscopy Unit, Cannizzaro Hospital, 95126 Catania, Italy
6. Radiology Unit, Cannizzaro Hospital, 95126 Catania, Italy