1. Department of Pneumonology, University Hospital of Alexandroupolis, Democritus University of Thrace, 68100 Alexandroupolis, Greece
2. Centre for Respiratory Research, Division of Medicine, University College London, London WC1E6JE, UK
3. Department of Radiology, University Hospital of Alexandroupolis, Democritus University of Thrace, 68100 Alexandroupolis, Greece
4. Department of Pathology, University Hospital of Alexandroupolis, Democritus University of Thrace, 68100 Alexandroupolis, Greece
5. Department of Cardiac and Thoracic Surgery, University Hospital of Alexandroupolis, Democritus University of Thrace, 68100 Alexandroupolis, Greece