1. Integrated Research and Treatment Center Transplantation; Hannover Medical School; Hannover Germany
2. Clinic for Neurology; Hannover Medical School; Hannover Germany
3. Clinic for Visceral and Transplantation Surgery; Hannover Medical School; Hannover Germany
4. Clinic for Gastroenterology, Hepatology and Endocrinology; Hannover Medical School; Hannover Germany
5. Department of Internal Medicine I; University Hospital Bonn; Bonn Germany
6. Institute for Biometry; Hannover Medical School; Hannover Germany