1. Department of Clinical Neurophysiology, TYKS-SAPA, Hospital District of Southwest Finland, Turku, Finland
2. Sleep Research Centre, Department of Pulmonary Diseases and Clinical Allergology, University of Turku, Turku, Finland
3. Department of Obstetrics and Gynecology, Turku University Hospital and University of Turku, Turku, Finland
4. Heart Center, Turku University Hospital and University of Turku, Turku, Finland