1. Department of Gastroenterology, Hepatology and Infectious Diseases, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
2. Center for Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO ABCD), Düsseldorf, Germany
3. Department of General, Visceral and Transplantation Surgery, University Hospital RWTH Aachen, Aachen, Germany
4. Department of Surgery and Transplantation, University Hospital Essen, Essen, Germany