1. Department of General, Visceral and Pediatric Surgery, University Medical Center, Göttingen, Germany
2. Targos Molecular Pathology, Pathology Nordhessen, Kassel, Germany
3. Department of Medical Statistics, University Medical Center, Göttingen, Germany
4. Department of Pathology, University Medical Center, Göttingen, Germany
5. Department of Radiotherapy and Radiooncology, University Medical Center, Göttingen, Germany