1. Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
2. Department of Respiratory and Sleep Medicine, Sleep Disorders Centre, Princess Alexandra Hospital, Brisbane, QLD, Australia
3. Research Unit of Oral Health Sciences, University of Oulu, Oulu, Finland
4. Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
5. Department of Otorhinolaryngology, Kuopio University Hospital, Kuopio, Finland
6. Department of Oncology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
7. Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland