1. U.O.C. Radiodiagnostica Lentini, ASP Siracusa, 96016 Siracusa, Italy
2. Institute of Nephrology and Dialysis—Nephrological, Vascular and Internal Medicine Diagnostic Ultrasound Service, Maggiore Hospital of Modica, ASP Ragusa, 97015 Modica, Italy
3. Department of Medical Surgical Sciences and Advanced Technologies “GF Ingrassia”, University Hospital Policlinico G. Rodolico-San Marco, University of Catania, 95123 Catania, Italy
4. Division of Pediatric Surgery, University Hospital Policlinico G. Rodolico-San Marco, University of Catania, 95123 Catania, Italy
5. Casa di Cura Regina Pacis, 93017 San Cataldo, Italy
6. UOSD I.P.T.R.A.-Department of Medical Surgical Sciences and Advanced Technologies “GF Ingrassia”, University Hospital Policlinico G. Rodolico-San Marco, University of Catania, 95123 Catania, Italy