1. Department of General, Visceral und Vascular Surgery, Otto-von-Guericke University, Magdeburg, Germany
2. Clinical Biochemistry Group, Medizinische Klinik und Poliklinik IV, University of Munich, Munich, Germany
3. Department of Pathology, Otto-von-Guericke University, Magdeburg, Germany
4. Institute of Pathology, Ludwig-Maximilians-University (LMU), Munich, Germany
5. Department of Radiation Oncology, Ludwig-Maximilians-University (LMU), Munich, Germany
6. Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, Cologne, Germany
7. Present address: Department of General, Visceral and Cancer Surgery, University Hospital of Cologne, Cologne, Germany