1 MSc Programme in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
2 MSc Programme in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece; Sleep Unit, Department of Pulmonology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
3 MSc Programme in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece; Sleep Unit, Department of Pulmonology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece. Electronic address: steiropoulos@yahoo.com.