1. Sleep Disorders Unit; Department of Neurology; Istanbul University Cerrahpasa Faculty of Medicine; Istanbul Turkey
2. Department of Chest Diseases; Faculty of Medicine; Hacettepe University; Istanbul Turkey
3. Department of Neurology; Faculty of Medicine; Erciyes University; Kayseri Turkey
4. Sleep Disorders Diagnosis and Treatment Center; Ministry of Health Diskapi Yildirim Beyazit Training and Research Hospital; Istanbul Turkey
5. Department of Chest Diseases; Faculty of Medicine; Dokuz Eylül University; Izmir Turkey
6. Department of Psychiatry; Gulhane Military Academy of Medicine; Ankara Turkey
7. Department of Neurology; Faculty of Medicine; Celal Bayar University; Manisa Turkey