1. I. Department of Medicine; Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf; Hamburg; Germany
2. Department of Tumor Biology; University Medical Center Hamburg-Eppendorf; Hamburg; Germany
3. Division of Gastroenterology and Hepatology; Department of Medicine III; Medical University of Vienna; Vienna; Austria
4. Department of Hepatobiliary and Transplant Surgery; University Medical Center Hamburg-Eppendorf; Hamburg; Germany