1. Department of Medical Oncology University Hospital and Ruhrlandklinik, West German Cancer Center Essen Germany
2. Department of Radiation Oncology University Hospital Essen Essen Germany
3. Department of Thoracic Surgery, Universitätsklinikum Tübingen, Universität Tübingen Tübingen Germany
4. Department of Medical Oncology Robert‐Bosch Krankenhaus Stuttgart Germany
5. Department of Pulmonology University Medicine Mainz Mainz Germany
6. Department of Radiation Oncology University Medicine Mainz Mainz Germany
7. Robert Bosch Center for Tumor Diseases (RBCTD), Robert‐Bosch Hospital Stuttgart Germany
8. Department of Radiation Oncology University Medicine Düsseldorf Düsseldorf Germany
9. Department of Pulmonology, West German Cancer Center Essen Germany
10. Klinik für Strahlentherapie, Evangelisches Krankenhaus Gelsenkirchen Gelsenkirchen Germany
11. Department of Pulmonology University Medicine Tuebingen Tübingen Germany
12. Department of Radiation Oncology (Maastro) Maastricht University Medical Center, GROW School Maastricht The Netherlands
13. Department of Radiation Oncology University Medicine Munich Munich Germany
14. Department of Thoracic Surgery, Lungenklinik Hemer Hemer Germany
15. Institute for Medical Informatics, Biometry and Epidemiology University of Duisburg‐Essen Essen Germany
16. Deutsches Konsortium für Translationale Krebsforschung (DKTK) Germany
17. Department of Pulmonology, Interventional Bronchology, West German Cancer Center Essen Germany
18. Department of Thoracic Oncology, Ruhrlandklinik Essen Germany
19. Department of Thoracic Surgery, Ruhrlandklinik Essen, West German Cancer Center Essen Germany