1. Department of Gastroenterology Hepatology and Infectious Diseases, University Hospital of Düsseldorf, Düsseldorf, Germany
2. Center for Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO ABCD), Düsseldorf, Germany
3. Medical Outpatient Department, Charité Universitätsmedizin Berlin, Berlin, Germany
4. Ernst von Bergmann Klinikum, Department of Gastroenterology, Hepatology, Infectious Diseases and Rheumatology, Potsdam, Germany
5. Schwarzwald-Baar Klinikum Villingen-Schwenningen GmbH, Villingen-Schwenningen, Germany