1. Department of Gastroenterology, Hepatology and Endocrinology; Hannover Medical School; Hannover Germany
2. Department of Gastroenterology, Hepatology and Endemic Medicine; Beni Suef University; Beni Suef Egypt
3. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation; Hannover Medical School; Hannover Germany
4. Department of Visceral and Transplantation Surgery; Hannover Medical School; Hannover Germany