1. Ear, Nose and Throat (ENT) Department, Private Polatli Can Hospital, Polatli-Ankara, Turkey
2. ENT Clinics, Tuzla State Hospital, Istanbul, Turkey
3. ENT Department, Faculty of Medicine, Kirikkale University, Kirikkale, Turkey
4. ENT Clinics, Konya Training and Research Hospital, Konya, Turkey
5. ENT Clinic, Kumluca State Hospital, Antalya, Turkey
6. ENT Department, King Saud University, Riyadh, Saudi Arabia
7. Department for Otorhinolaryngology, Head and Neck Surgery, University of Siena, Siena, Italy
8. ENT Department, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey