1. Department of Hematology and Medical Oncology Comprehensive Cancer Center Augsburg University Medical Center Augsburg Augsburg Germany
2. Institute of Pathology University Medical Center Göttingen Göttingen Germany
3. Department of Gastroenterology and Gastrointestinal Oncology University Medical Center Göttingen Göttingen Germany
4. Department of General, Visceral and Pediatric Surgery University Medical Center Göttingen Göttingen Germany
5. Institute of Pathology and Molecular Diagnostics University Medical Center Augsburg Augsburg Germany
6. Institute of Pathology Hannover Medical School Hannover Germany