1. Department of Cardiothoracic Surgery, University Hospital of Cologne , Germany
2. Department of Pathology, Charité—Universitätsmedizin Berlin , Germany
3. Department of Thoracic Surgery, University Medicine Essen—Ruhrlandklinik, University Duisburg-Essen , Germany
4. Department of Pathology, University Hospital of Cologne , Germany
5. Department of Infectious Diseases and Respiratory Medicine, Charité—Universitätsmedizin Berlin , Germany
6. Department of Surgery, Charité—Universitätsmedizin Berlin , Germany
7. University of Cologne, Faculty of Medicine, University Hospital Cologne, Clinic III for Internal Medicine , Germany