1. Department of Gastroenterology, Hepatology and Endocrinology; Hannover Medical School; Hannover Germany
2. Department of Medicine I; University Medical Center Schleswig-Holstein; Lübeck Germany
3. Division of Gastroenterology and Hepatology; Department of Internal Medicine III; Medical University of Vienna; Vienna Austria
4. Institute for Diagnostic and Interventional Radiology; Hannover Medical School; Hannover Germany