1. Institute of Pathology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
2. German Cancer Consortium (DKTK), Partner Site University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
3. Department of Thoracic Surgery and Thoracical Endoscopy, Ruhrlandklinik, West German Lung Centre, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
4. Department of Medical Oncology, West German Cancer Center, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
5. Ruhrlandklinik, West German Lung Centre, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
6. Department of Pathology, Diakonissenkrankenhaus Flensburg, Flensburg, Germany