University of Duisburg-Essen - University Hospital Essen, University Hospital Magdeburg - Department of Gastroenterology, Hepatology and Infectious Diseases, University Hospital Magdeburg - Department of Gastroenterology, Hepatology and Infectious Diseases, University of Duisburg-Essen - University Hospital Essen, University of Duisburg-Essen - University Hospital Essen, University of Duisburg-Essen - University Hospital Essen, University of Duisburg-Essen - University Hospital Essen, University Hospital Würzburg, University of Leipzig - University Hospital Leipzig, University of Leipzig - University Hospital Leipzig, Hannover Medical School - Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Johannes Gutenberg University Mainz - University Medical Center, Johannes Gutenberg University Mainz - University Medical Center, Johannes Gutenberg University Mainz - University Medical Center, University of Hamburg - Department of Medicine, University of Hamburg - Department of Medicine, University of Hamburg - Department of Medicine, University of Freiburg - Faculty of Medicine, University of Freiburg - Faculty of Medicine, University Hospital Magdeburg - Department of Gastroenterology, Hepatology and Infectious Diseases, University Hospital Magdeburg - Department of Gastroenterology, Hepatology and Infectious Diseases, Heidelberg University - University Hospital Heidelberg, Kitasato University - Department of Gastroenterology, Ogaki Municipal Hospital, Gifu Kyoritsu University, University of Liverpool, University of Duisburg-Essen - University Hospital Essen, University of Marburg, University of Duisburg-Essen - University Hospital Essen, University of Liverpool and University Hospital Magdeburg - Department of Gastroenterology, Hepatology and Infectious Diseases