1. 2nd Medical Department; Technische Universität München; Munich Germany
2. Institute of Medical Statistics and Epidemiology; Technische Universität München; Munich Germany
3. Eurotransplant International Foundation; Leiden the Netherlands
4. Department of Surgery; Gent University Hospital Medical School; Gent Belgium
5. Department of General, Visceral and Transplant Surgery, Großhadern Clinic; University of Munich; Munich Germany