1. Department of Chest Diseases; Ege University; Izmir Turkey
2. Center for Sleep and Vigilance Disorders; Sahlgrenska Academy; Gothenburg University; Gothenburg Sweden
3. Sleep Disorders Center, Respiratory Medicine; Sahlgrenska University Hospital; Gothenburg Sweden
4. Department of Respiratory Medicine; St Vincent's University Hospital; University College Dublin, School of Medicine; Dublin Ireland
5. Multidisciplinary Sleep Disorders Centre; Antwerp University Hospital and University of Antwerp; Antwerp Belgium
6. Service dÉxplorations Fonctionnelles Multidisciplinaires Hospital Antoine Beclere; Clamart France
7. Division of Medicine; Department of Pulmonary Diseases; Turku University Hospital and Sleep Research Centre; Department of Pulmonary Diseases and Clinical Allergology, University of Turku; Turku Finland
8. Sleep Laboratory, ENT Department; Førde Central Hospital; Førde Norway
9. Biomedical Department of Internal and Specialistic Medicine (DiBiMIS); Section of Pneumology; University of Palermo and CNR Institute of Biomedicine and Molecular Immunology; Palermo Italy
10. Department of Thoracic Medicine; Sleep Disorders Center; University of Crete; Heraklion Greece