1. Bandırma State Hospital, Ear Nose and Throat Surgery Clinic, Bandırma, 10200 Balıkesir, Turkey
2. Erzincan University, Ear Nose and Throat Surgery Clinic, 24100 Erzincan, Turkey
3. Ankara Oncology Training and Research Hospital, Ear Nose and Throat Surgery Clinic, Yenimahalle, 06200 Ankara, Turkey