1. Master Programme in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
2. Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
3. Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
4. Laboratory of Nuclear Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
5. Department of Pneumonology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
6. Laboratory of Pharmacology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece