1. Department of Gastroenterology and Gastrointestinal Oncology, University Medical Center Goettingen, Goettingen, Germany
2. Department of Diagnostic and Interventional Radiology, University Medical Center Goettingen, Goettingen, Germany
3. Department of Pathology, University Medical Center Goettingen, Goettingen, Germany
4. Department of General, Visceral, and Pediatric Surgery, University Medical Center Goettingen, Goettingen, Germany
5. Department of Gastroenterology and Gastrointestinal Oncology, University Medical Center Goettingen, Robert Koch Strasse 40, 37075 Goettingen, Germany