1. Department of Anesthesia and Intensive Care, “Policlinico-San Marco” University Hospital, 95123 Catania, Italy
2. Radiology Unit 1, University Hospital Policlinico “G. Rodolico-San Marco”, 95123 Catania, Italy
3. School of Anesthesia and Intensive Care, University of Catania, 95100 Catania, Italy
4. School of Anesthesia and Intensive Care, University “Magna Graecia”, 88100 Catanzaro, Italy
5. Department of Medical Surgical Sciences and Advanced Technologies “GF Ingrassia”, University of Catania, 95123 Catania, Italy
6. Department of Surgery and Medical-Surgical Specialties, University of Catania, 95123 Catania, Italy