1. Department of Gastroenterology and Hepatology University Hospital Essen, University Duisburg‐Essen Essen Germany
2. Institute of Virology University Hospital Essen, University Duisburg‐Essen Essen Germany
3. Department of Medicine, Center for Internal Medicine University Medical Center Hamburg‐Eppendorf Hamburg Germany
4. Department of General, Visceral and Transplantation Surgery University Hospital Essen University of Duisburg‐Essen Essen Germany
5. Department of Pathology University Hospital Essen, University of Duisburg‐Essen Essen Germany
6. Department of Internal medicine Evangelisches Klinikum Niederrhein GmbH Duisburg Germany