1. Department of Medical and Surgical Sciences and Advanced Technologies “GF Ingrassia”, University of Catania, Via S. Sofia, 87, 95123 Catania, Italy
2. Department of General Surgery and Medical-Surgical Specialties, University of Catania, Via Plebiscito, 628, 95124 Catania, Italy
3. Vascular Surgery Unit, University Hospital of Catania, Via Santa Sofia 87, 95123 Catania, Italy