1. Department of Medicine III, University Hospital RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
2. Department of Internal Medicine III, University Hospital of Schleswig Holstein, Campus Kiel, Rosalind-Franklin-Str. 12, 24105 Kiel, Germany
3. Department of Visceral and Transplantation Surgery, University Hospital RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
4. Department of Urology, University Hospital Cologne, Cologne, Germany
5. Department of Hepatology and Gastroenterology, Charité University Medicine Berlin, Augustenburger Platz 1, 10117 Berlin, Germany
6. Department of Surgery, Maastricht University Medical Centre (MUMC), PO Box 5800, Maastricht, Netherlands
7. Division of Gastroenterology, Hepatology and Hepatobiliary Oncology, University Hospital RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany