1. Department of Surgery University of Maryland School of Medicine Baltimore MD USA
2. Department of Vascular Surgery Centre Hospitalier Universitaire Vaudois University of Lausanne Lausanne Switzerland
3. Transplantation Center Centre Hospitalier Universitaire Vaudois University of Lausanne Lausanne Switzerland
4. Faculty of Science and Medicine Section of Medicine University of Fribourg Fribourg Switzerland
5. Division of Immunology and Allergy University Hospital of Lausanne Lausanne Switzerland