1. Chair of Angiology, Department of Internal Medicine, "A. Francaviglia," University of Catania
2. Department of Angiology, S. Eugenio Hospital, Rome
3. Chair of Medical Pathophysiology, University of Catania
4. Chair of Vascular Surgery, Department of Vascular Surgery, Garibaldi Hospital, University of Catania
5. Medical Department, Alfa Wassermann S.p.A., Bologna, Italy