1. Center for Integrated Oncology Köln Bonn, Cologne, Germany
2. Lung Cancer Group Cologne, Department I for Internal Medicine, University Hospital of Cologne, Cologne, Germany
3. Institute of Pathology, University Hospital of Cologne, Cologne, Germany
4. Department for Pulmonology and Thoracic Oncology, Lung Clinic Hemer, Hemer, Germany
5. Clinic for Hematology, Oncology and Palliative Care, Malteser Hospital, Bonn, Germany
6. Gastrointestinal Cancer Group Cologne, Department I for Internal Medicine, University Hospital of Cologne, Cologne, Germany
7. Lung Clinic Merheim, Hospital of Cologne, Cologne, Germany
8. Johanniter Hospital, Evangelical Clinics of Bonn, Bonn, Germany
9. Clinic for Pneumology and Allergology Center for Sleep Medicine and Respiratory Care, Bethanien Hospital, Solingen, Germany
10. Department of Medicine IV, University Hospital RWTH Aachen, Aachen, Germany
11. Institute of Medical Statistics, Informatics, and Epidemiology, University of Cologne, Cologne, Germany