1. Department of Otorhinolaryngology, Osmangazi University Medical Faculty, Eskisehir, Turkey,
2. Department of Otorhinolaryngology, Izmir Ataturk Training and Research Hospital, Izmir, Turkey,
3. Department of Otorhinolaryngology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey,
4. Department of Epidemiology of Allergic and Respiratory Diseases, UMR-S 707 INSERM, Paris, France,
5. Medical School Saint-Antoine, Université Pierre and Marie Curie, Paris, France,
6. Department of Biostatistics, Osmangazi University Medical Faculty, Eskisehir, Turkey,
7. Department of Otorhinolaryngology, Bezm-i Alem Valide Sultan Vakýf Gureba Training and Research Hospital, Istanbul, Turkey,
8. Department of Otorhinolaryngology, Sisli Etfal Training and Research Hospital, Istanbul, Turkey,
9. Department of Otorhinolaryngology, Ankara Numune Training and Research Hospital, Ankara, Turkey,
10. Department of Otorhinolaryngology, Ege University Medical Faculty, Izmir, Turkey,
11. Department of Otorhinolaryngology, Dokuz Eylul University Medical Faculty, Izmir, Turkey,
12. Department of Otorhinolaryngology, Mustafa Kemal University Tayfur Ata Sokmen Medical Faculty, Hatay, Turkey
13. Department of Otorhinolaryngology, Baskent University Medical Faculty, Adana, Turkey