1. 1 University of Saarland Department of General, Visceral, Vascular and Pediatric Surgery Kirrberger Street 66421 Homburg Germany
2. 2 Medical Faculty of the Humboldt University Department of General, Visceral and Transplantation Surgery Berlin Germany
3. 3 Medical Faculty of the Humboldt University Department of Radiology, Charité Virchow Clinic Berlin Germany