1. Department of Gastroenterology, Hepatology and Endocrinology; Hannover Medical School; Hannover Germany
2. Department of Diagnostic and Interventional Radiology; Hannover Medical School; Hannover Germany
3. Interfaculty Institute of Biochemistry; University of Tübingen; Tübingen Germany
4. German Cancer Consortium (DKTK); German Cancer Research Center (DKFZ); Heidelberg Germany