1. Otorhinolaryngology Clinic; Gumushane Public Hospital; Gumushane Turkey
2. Neurology Department; Cerrahpasa Medical School; Istanbul University; Istanbul Turkey
3. Otorhinolaryngology Department; Cerrahpasa Medical School; Istanbul University; Istanbul Turkey
4. Otorhinolaryngology Clinic; Diyarbakir Selahaddin Eyyubi Public Hospital; Diyarbakir Turkey
5. Audiology Unit; Cerrahpasa Medical Faculty; Istanbul University; Istanbul Turkey