1. Department of Respiratory Medicine and Sleep; Landspitali-The National University Hospital of Iceland; Reykjavik Iceland
2. Faculty of Medicine; University of Iceland; Reykjavik Iceland
3. Nox Medical; Reykjavik Iceland
4. School of Computer Science; Carnegie Mellon University; Pittsburgh PA USA
5. Department of Electrical Engineering and Information Technology; Karlsruhe Institute of Technology; Karlsruhe Germany