1. Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, Lung Cancer Group Cologne, University of Cologne, Cologne, Germany
2. Department of Pathology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
3. Faculty of Medicine and University Hospital Cologne, Institute for Diagnostic and Interventional Radiology, University of Cologne, Cologne, Germany
4. Practice for Clinical Hematology and Oncology, Frechen, Germany
5. Department of Gastroenterology and Hepatology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
6. Institute of Pathology, Heidelberg University Hospital, Heidelberg, Germany