1. Department of Technical Physics University of Eastern Finland Kuopio Finland
2. Diagnostic Imaging Center Kuopio University Hospital Kuopio Finland
3. Reykjavik University Sleep Institute, School of Technology Reykjavik University Reykjavik Iceland
4. Landspitali–The National University Hospital of Iceland Reykjavik Iceland
5. Science Service Center Kuopio University Hospital Kuopio Finland
6. School of Information Technology and Electrical Engineering The University of Queensland Brisbane Queensland Australia