1. Baskent University Faculty of Medicine, Department of Otorhinolaryngology, Bahcelievler, Ankara, Turkey
2. Baskent University Adana Research and Training Center, Department of Otorhinolaryngology, Seyhan, Adana, Turkey
3. Acibadem University Faculty of Medicine, Department of Otorhinolaryngology, Acibadem, Kadikoy, Istanbul, Turkey