1. Department of Otorhinolaryngology, Medical Faculty , Eskisehir Osmangazi University , Eskisehir , Turkey
2. Department of Otorhinolaryngology, Medical Faculty , Kirikkale University , Kirikkale , Turkey
3. Department of Pulmonary Diseases, Medical Faculty , Celal Bayar University , Manisa , Turkey
4. ENT Department , Gungoren Private Hospital , Istanbul , Turkey
5. Department of Pulmonary Diseases, Medical Faculty , Cerrahpașa University , İstanbul , Turkey
6. Department of Pulmonary Diseases, Medical Faculty , Hacettepe University , Ankara , Turkey