1. Department of Gastroenterology, Hepatology, Infectious Diseases and Endocrinology Hannover Medical School Hannover Germany
2. Division of Hepatology, Department of Internal Medicine II University Hospital Würzburg Würzburg Germany
3. Department of Internal Medicine I University Medical Center Mainz Mainz Germany
4. Interfaculty Institute of Biochemistry University of Tuebingen Tuebingen Germany
5. German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ) Heidelberg Germany