1. Department of Internal Medicine and Gastroenterology, Marienhospital Gelsenkirchen, 45886 Gelsenkirchen, Germany
2. Department of Medicine, University Hospital Knappschaftskrankenhaus Bochum, 44892 Bochum, Germany
3. Faculty of Medicine, Ruhr University Bochum, 44901 Bochum, Germany
4. Department of Medicine and Gastroenterology, Katholische Kliniken im Märkischen Kreis gem, GmbH, 58638 Iserlohn, Germany
5. Department of Nephrology, Alfried-Krupp Krankenhaus Essen, 45131 Essen, Germany
6. Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
7. Division Infectious Diseases and Critical Care Medicine, Department of Medicine, University Hospital Knappschaftskrankenhaus, 44892 Bochum, Germany