1. Department of General, Visceral and Cancer Surgery; University of Cologne; Köln Germany
2. Cologne Interventional Immunology; University of Cologne; Köln Germany
3. Cologne Transplant Center; University of Cologne; Köln Germany
4. Department of Internal Medicine II; University of Cologne; Köln Germany
5. Institute for Clinical Transfusion Medicine; Merheim Medical Center Cologne; Köln Germany
6. Institute of Pathology; University of Cologne; Köln Germany
7. Department of Internal Medicine I; University of Cologne; Köln Germany