1. Primary Health Care of the Capital Area , Reykjavik, Iceland
2. Faculty of Medicine, University of Iceland , Reykjavik, Iceland
3. Division of Sleep Medicine, Department of Medicine, Perelman School of Medicine , University of Pennsylvania, Philadelphia, Pennsylvania, USA
4. Sleep Department, Landspitali - The National University Hospital of Iceland , Reykjavik, Iceland
5. Department of Medicine, Corporal Michael J. Crescenz VA Medical Center, Philadelphia , Pennsylvania, USA
6. Interdisciplinary Center of Sleep Medicine, Charité University Hospital , Berlin, Germany
7. Department of Respiratory and Critical Care Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai, China
8. Charles Perkins Centre, Faculty of Medicine and Health, University of Sydney , Sydney, Australia
9. Department of Respiratory and Sleep Medicine , Royal North Shore Hospital, Australia
10. Division of Pulmonary, Critical Care, and Sleep Medicine , The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
11. Western Australian Sleep Disorders Research Institute, Sir Charles Gairdner Hospital, Nedlands , Western Australia, Australia
12. Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Nedlands , Western Australia, Australia
13. Department of Medical Sciences: Respiratory, Allergy and Sleep Research, Uppsala University , Uppsala, Sweden
14. Icelandic Heart Association , Kopavogur, Iceland
15. Sleep disorders center, Department of Medicine, University of Manitoba , Winnipeg, Manitoba, Canada
16. Charles Perkins Centre, Faculty of Engineering, University of Sydney , Sydney, Australia
17. Department of Psychobiology, Universidade Federal de São Paulo , São Paulo, Brazil