1. Institute of Pathology, University Hospital Essen, University of Duisburg, Essen, Germany
2. Ruhrlandklinik, University Hospital Essen, University of Duisburg, Essen, Germany
3. Institute of Pathology, Charité Universitaetsmedizin, Berlin, Germany
4. Institute of Pathology, Helios Klinikum Emil von Behring, Berlin, Germany
5. Department of Medical Oncology, West German Cancer Center, University Hospital Essen, University of Duisburg, Essen, Germany
6. Ruhrlandklinik, West German Lung Center University Hospital Essen, University of Duisburg, Essen, Germany
7. Department of Pulmonology, Helios Klinikum Emil von Behring, Berlin, Germany
8. Institute of Pathology, DIAKO Hospital, Flensburg, Germany