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. Vienna Hepatic Hemodynamic Laboratory Medical University of Vienna Vienna Austria
4. Department of Gastroenterology and Hepatology University Hospital Essen Essen Germany
5. Institute for Diagnostic and Interventional Radiology Hannover Medical School Hannover Germany
6. Center for Information Management (ZIMt) Hannover Medical School Hannover Germany