1. Division of Hematology; University of Catania, Ospedale Ferrarotto, A.O. Policlinico-Vittorio Emanuele; Catania; Italy
2. Department of Experimental Oncology; Mediterranean Institute of Oncology; Viagrande; Catania; Italy
3. Division of Radiology; University of Palermo; Palermo; Italy
4. Division of Gastroenterology; A.O. Policlinico-Vittorio Emanuele; Catania; Italy