1. Department of Internal Medicine B, Gastroenterology, Hepatology, Endocrinology and Clinical Infectiology, University Hospital Münster, 48149 Münster, Germany
2. Department of Hepatology, Gastroenterology and Transplantation Medicine, University Hospital Essen, 45147 Essen, Germany
3. Department of Internal Medicine, University Teaching Hospital Raphaelsklinik Münster, 48143 Münster, Germany
4. Department of Internal Medicine II Gastroenterology, University Teaching Hospital Euregio-Klinik Nordhorn, 48527 Nordhorn, Germany