1. Department of Otorhinolaryngology; Medical School, Democritus University of Thrace; Alexandroupolis Greece
2. Department of Psychiatry; Medical School, Democritus University of Thrace; Alexandroupolis Greece
3. Department of Statistics; Medical School; Democritus University of Thrace; Alexandroupolis Greece
4. Department of Otorhinolaryngology; Medical School, University of Crete; Heraklion