1. Institute of Pathology, University of Cologne, Cologne, Germany
2. Department of General, Visceral and Cancer Surgery, University of Cologne, Cologne, Germany
3. Department of Thorax and Oesophageal Surgery, Agaplesion Markus Krankenhaus, Frankfurt/Main, Germany
4. Department I of Internal Medicine, Center for Integrated Oncology (CIO), University of Cologne, Cologne, Germany