1. Department of General and Transplantation Surgery; Hannover Medical School; Hannover Germany
2. Department of Hematology Hemostasis, Oncology and Stem Cell Transplantation; Hannover Medical School; Hannover Germany
3. Department of Surgery; University Hospital Heidelberg; Heidelberg Germany
4. Department of Anaesthesiology and Intensive Care Medicine; Hannover Medical School; Hannover Germany