| Affiliation: | 1. Department of Medicine I, University Clinic of Bonn, , Bonn, Germany;2. Department of Cellular and Molecular Pathology, German Cancer Research Center, , Heidelberg, Germany;3. Department of Medicine III, University Hospital Aachen, , Aachen, Germany;4. Department of Medicine II, Saarland University Hospital, , Saarland, Germany;5. Department of Gastroenterology and Hepatology, University Hospital Essen, , Essen, Germany;6. Division of Gastroenterology and Hepatology, University Hospital of Zurich, , Zurich, Switzerland |
