1. Hospital of Internal Medicine; Haematology, Oncology, and Immunology, University Hospital Giessen and Marburg; Baldingerstraße Marburg Germany
2. Hospital of Diagnostic and Interventional Radiology; University Hospital, Giessen and Marburg, Baldingerstraße; Marburg Germany
3. Interdisciplinary Center of Ultrasound; University Hospital Giessen and Marburg, Baldingerstraße; Marburg Germany
4. Department Gastroenterology and Gastrointestinal Oncology; University Medical Centre Göttingen; Robert-Kochstr. 40, 37075 Göttingen Germany