1. Primary Health Care of the Capital Area Reykjavik Iceland
2. Faculty of Medicine University of Iceland Reykjavik Iceland
3. Department of Medical Sciences: Respiratory, Allergy and Sleep Research Uppsala University Uppsala Sweden
4. Icelandic Heart Association Kopavogur Iceland
5. Ear, Nose and Throat (ENT) Department Landspitali – The National University Hospital of Iceland Reykjavik Iceland
6. Sleep Department Landspitali – The National University Hospital of Iceland Reykjavik Iceland
7. Division of Sleep Medicine Department of Medicine Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
8. Department of Medicine Corporal Michael J. Crescenz VA Medical Center Philadelphia Pennsylvania USA