1. Department of Infectious Diseases, 2nd Department of Internal Medicine, University General Hospital Alexandroupolis, Democritus University of Thrace, Alexandroupoli, Greece
2. University Pneumonology Department, University General Hospital Alexandroupolis, Democritus University of Thrace, Alexandroupoli, Greece
3. Department of Medical Statistics, Medical School, Democritus University of Thrace, Alexandroupoli, Greece