1. Department of Pneumonology, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece
2. Second Department of Internal Medicine, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece
3. Department of Radiology, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece
4. Department of Microbiology, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece