1. Institute for Transfusion Medicine Hannover Medical School Hannover Germany
2. Transregional Collaborative Research Centre 127 Munich Germany
3. Department of Biotechnology Institute of Farm Animal Genetics Friedrich‐Loeffler‐Institute Federal Research Institute for Animal Health Greifswald‐Insel Riems Germany
4. Clinic for Gastroenterology, Hepatology and Endocrinology Hannover Medical School Hannover Germany
5. Transplantation Laboratory Clinic for General Visceral and Transplantation‐Surgery Hannover Medical School Hannover Germany
6. Diabetes Center Medizinische Klinik und Poliklinik IV Klinikum der Universität München Munich Germany