1. Department of Otolaryngology, Yeditepe University Hospital, Istanbul, Turkey
2. ENT Clinic, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, Istanbul
3. ENT Clinic, Dogubayazit Government Hospital, Agri, Turkey
4. ENT Clinic, Erbaa Government Hospital, Tokat, Turkey
5. Department of Otolaryngology, Selcuk University, Konya, Turkey