1. Department of Molecular GI Oncology, Faculty of Medicine Ruhr‐University Bochum Germany
2. Department of Medical Oncology, West German Cancer Center University Hospital Essen Germany
3. Bridge Institute of Experimental Tumor Therapy, West German Cancer Center University Hospital Essen, University Duisburg‐Essen Germany
4. Center for Hemato‐Oncological Diseases University Hospital Knappschaftskrankenhaus, Ruhr‐University Bochum Germany
5. Institute of Pathology Ruhr University Bochum Germany
6. Department of Visceral and General Surgery St. Josef Hospital Dortmund Germany
7. Department of Visceral and General Surgery University Hospital Knappschaftskrankenhaus, Ruhr‐University Bochum Germany
8. Institute of Medical Genetics and Applied Genomics University of Tübingen Germany