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