1. Department of Surgery, Campus Virchow-Klinikum and Charité Campus Mitte, Charité – Universitätsmedizin Berlin, Berlin, Germany
2. Department of Visceral-, Transplantation-, Thoracic- and Vascular Surgery, University Hospital Leipzig, Leipzig, Germany
3. Institute of Pathology, University Hospital Leipzig, Leipzig, Germany
4. The Transplant Institute and Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA, USA
5. Department of Hepato-Pancreato-Biliary Surgery, 310Klinik Nürnberg, Nürnberg, Germany