1. Department of Gastroenterology and Hepatology, University Hospital Essen, University of Duisburg-Essen, Germany
2. Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Germany
3. Institute of Pathology, University Hospital Essen, University of Duisburg-Essen, Germany
4. Department of General, Visceral and Transplantation Surgery, University Hospital Essen, University of Duisburg-Essen, Germany
5. Department of Infectious Diseases and Department of Nephrology, University Hospital Essen, University of Duisburg-Essen, Germany