1. Department of Otolaryngology, General Hospital of Rethymnon, Crete, Greece
2. Department of Neurology, G. Gennimatas Hospital, Athens, Greece
3. Department of Electrical Engineering, Division of Applied Mathematics, Lamia Institute of Technology and Education, Lamia, Greece
4. Department of Otolaryngology, G. Gennimatas Hospital, Athens, Greece
5. Department of Otolaryngology, Hippokration Hospital, University of Athens, Athens, Greece