1. Department of Medicine A Hematology, Oncology and Pulmonary Medicine, University Hospital Muenster Muenster Germany
2. Medical Department IV Pulmonary Medicine and Thoracic Oncology, Klinikum Ingolstadt Ingolstadt Germany
3. Department of Internal Medicine II University Hospital Regensburg Regensburg Germany
4. Institute of Biostatistics and Clinical Research Westfaelische‐Wilhelms University Muenster Muenster Germany