1. Department of Medicine A, Hematology, Oncology and Pulmonary MedicineUniversity Hospital Muenster Muenster Germany
2. Gerhard Domagk Institute of PathologyUniversity Hospital Muenster Muenster Germany
3. Department of Thoracic SurgeryRems‐Murr‐Klinikum Winnenden Winnenden Germany
4. Department of Thoracic SurgeryNiels‐Stensen‐Kliniken Ostercappeln Ostercappeln Germany
5. Institute of Biostatistics and Clinical Research, Westfaelische Wilhelms‐University Muenster Muenster Germany
6. Institute of Pathology, University of Cologne Cologne Germany