1. Department of Otorhinolaryngology, Medical School, Democritus University of Thrace, Alexandroupolis, Evros, Greece
2. Laboratory of Informatics, Medical School, Democritus University of Thrace, Alexandroupolis, Evros, Greece
3. Department of Otorhinolaryngology, Facial Plastic and Reconstructive Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany