1. Clinic for Gastroenterology, Hepatology and Infectious Diseases, University Hospital Düsseldorf Medical Faculty of Heinrich Heine University Düsseldorf Düsseldorf Germany
2. Department of Medicine III University Hospital RWTH Aachen Aachen Germany
3. Department of Diagnostic and Interventional Radiology University Hospital RWTH Aachen Aachen Germany
4. Department of Urology University Hospital Cologne Cologne Germany
5. Department of Hepatology and Gastroenterology Charité University Medicine Berlin Berlin Germany