1. Ministry of Health, Ear Nose Throat Clinic, Beypazarı State Hospital, Ankara, Turkey;
2. Ministry of Health, Otolaryngology, Head and Neck Surgery Department, Dışkapı Yıldırım Beyazıt Training and Research Hospital, Ankara, Turkey;
3. Ministry of Health, Department of Respiratory Medicine, Dışkapı Yıldırım Beyazıt Training and Research Hospital, Ankara, Turkey;
4. Private Ear Nose Throat Clinic, Ankara, Turkey;
5. Otolaryngology, Head and Neck Surgery Department, Medical Faculty, Yıldırım Beyazıt University, Ankara, Turkey