1. Department of Visceral‐, Thoracic‐ and Vascular Surgery Philipps‐University Marburg Marburg Germany
2. MH Statistik Beratung Marburg Germany
3. Department of Gastroenterology and Endocrinology Philipps‐University Marburg Marburg Germany
4. Department of Diagnostic and Interventional Radiology Philipps‐University Marburg Marburg Germany
5. Department of Nuclear Medicine Philipps‐University Marburg Marburg Germany