1. Dept. of Diabetology, Endocrinology, Nephrology University of Tübingen Tübingen Germany
2. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen Tübingen Germany
3. German Center for Diabetes Research (DZD e.V.) Neuherberg Germany
4. Dept. of General‐, Visceral‐ and Transplant Surgery University of Tübingen Tübingen Germany
5. Center for Clinical Transfusion Medicine Tübingen Germany
6. Institute for Clinical and Experimental Transfusion Medicine Medical Faculty of Tübingen University of Tübingen Tübingen Germany