1. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
2. Bouve College of Health Sciences School of Nursing, Northeastern University, Boston, MA
3. Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
4. Department of Sleep, Landspitali – The National University Hospital of Iceland, Reykjavik, Iceland
5. Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
6. Division of Sleep Medicine or Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA