1. Department of Vascular Surgery, St Franziskus Hospital, Münster, Germany
2. Clinic of Vascular and Endovascular Surgery, University of Münster, Münster, Germany
3. Division of Vascular Surgery, MedStar Union Memorial Hospital, Baltimore, USA
4. University of Florida, Gainesville, USA
5. New York University, New York, USA
6. Cleveland Clinic, Cleveland, USA