1. Ear, Nose and Throat (ENT) Department, Ankara Koru Hospital, Ankara, Turkey
2. ENT Department, Private Polatli Can Hospital, Polatli-Ankara, Turkey
3. ENT Department, Faculty of Medicine, Kirikkale University, Kirikkale, Turkey
4. ENT Clinics, Bayindir Icerenköy Hospital, Istanbul, Turkey
5. ENT Clinics, Tuzla State Hospital, Istanbul, Turkey
6. ENT Department, King Saud University, Riyadh, Saudi Arabia
7. Family Medicine Department, Eskisehir Osmangazi University, Eskisehir, Turkey
8. ENT Department, University Hospital, Rebro-KBC Zagreb, Croatia
9. ENT Department, Clinical Hospital Dubrava, Zagreb, Croatia
10. ENT Department, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey