1. Department of Vascular Surgery, St. Franziskus Hospital Münster, Germany
2. Clinic of Vascular and Endovascular Surgery, University of Münster, Germany
3. Department of Vascular Surgery, San Camillo Forlanini, Rome, Italy
4. Department of Vascular Surgery, University of Florence, Italy
5. Department of Vascular Surgery, University of Rome “Tor Vergata,” Rome, Italy
6. Division of Vascular Surgery, “G. Gennimatas” Thessaloniki General Hospital, Aristotle University of Thessaloniki, Greece
7. Department of Vascular Surgery, University of Perugia, Italy