1. Radiology Unit 1, Department of Medical Surgical Sciences and Advanced Technologies “GF Ingrassia”, University Hospital Policlinico “G. Rodolico-San Marco”, University of Catania, 95123 Catania, Italy
2. U.O.C. Diagnostica per Immagini P.O. “S. Marta e S. Verera” Acireale, ASP Catania, 95123 Catania, Italy
3. Institute of Internal Medicine, Medicine Department, Vittoria Hospital, ASP Ragusa, 97100 Ragusa, Italy
4. U.O.S.D. Radiologia, P.O. “G. Di Maria” Avola, ASP Siracusa, 96100 Siracusa, Italy