1. Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School Hannover Germany
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine III Medical University of Vienna Vienna Austria
3. Department of Internal Medicine University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
4. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation Hannover Germany
5. Hannover Medical School, Institute for Diagnostic and Interventional Radiology Hannover Germany