1. Dept. of Internal Medicine V – Pneumology, Allergology, and Intensive Care Medicine; University Hospital and University of Saarland, Homburg, Germany
2. Dept. of Thoracic and Cardiovascular Surgery, Saarland University Medical Center, Homburg/Saar, Germany
3. Dept. of Pathology, University of Saarland, Homburg/Saar, Germany