1. Department of Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany
2. Department of General, Visceral and Transplantation Surgery; Essen University Hospital; Essen Germany
3. Department of General and Visceral Surgery; St. Bernhard-Hospital Kamp-Lintfort; Kamp-Lintfort Germany
4. Department of General, Visceral and Transplant Surgery; University Hospital Tuebingen; Tuebingen Germany
5. Clinic for General, Abdominal and Transplant Surgery; Hannover Medical School (MHH); Hannover Germany
6. Department of General, Abdominal and Vascular Surgery; Jena University Hospital; Jena Germany
7. Clinic for General, Abdominal and Transplant Surgery; Charité University Medical Center Berlin; Berlin Germany
8. Department of General, Visceral and Transplant Surgery; University Hospital Heidelberg; Heidelberg Germany
9. Department of Surgery; University Hospital Regensburg; Regensburg Germany
10. Novartis Pharma GmbH; Nürnberg Germany