1. Division of Medicine, Department of Pulmonary Diseases, Turku University Hospital, Turku, Finland
2. Department of Pulmonary Diseases and Clinical Allergology, University of Turku, Turku, Finland
3. Sleep Research Centre, Department of Physiology, University of Turku, Turku, Finland
4. Department of Clinical Neurophysiology, Medical Imaging Centre and Hospital Pharmacy, Pirkanmaa Hospital District, Tampere University Hospital, Tampere, Finland
5. Department of Medical Physics, Medical Imaging Centre and Hospital Pharmacy, Pirkanmaa Hospital District, Tampere University Hospital, Tampere, Finland
6. School of Medicine, University of Tampere, Tampere, Finland
7. Unesta Research Center, Tampere, Finland
8. Department of Pulmonary Diseases, Tampere University Hospital, Tampere, Finland
9. Department of Clinical Neurophysiology, Satakunta Hospital District, Pori, Finland