1. Department of Otorhinolaryngology-Head and Neck Surgery; Yıldırım Beyazıt University; Ankara Turkey
2. Department of Otorhinolaryngology-Head and Neck Surgery; Ataturk Education and Research Hospital; Ankara Turkey
3. Department of Otorhinolaryngology-Head and Neck Surgery; Karaman State Hospital; Karaman Turkey
4. Department of Otorhinolaryngology-Head and Neck Surgery; Bitlis Tatvan State Hospital; Bitlis Turkey