1. Department of Otolaryngology; Head and Neck Surgery
2. Department of Sleep Laboratory; Yedikule Chest Disease and Thoracic Surgery Training and Research Hospital; Istanbul
3. Department of Medical Biochemistry; Istanbul Gaziosmanpasa Taksim Research and Training Hospital
4. Medical Faculty, Department of Otolaryngology, Head and Neck Surgery, Yuzuncu Yıl University; Van
5. Department of Medical Biochemistry
6. Department of Medical Biochemistry; Dışkapı Yıldırım Bayezit Training and Research Hospital; Ankara Turkey