1. Division of Sleep Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
2. Corporal Michael Crescenz VA Medical Center, Philadelphia, Pennsylvania
3. Department of Psychiatry, Stanford University, Palo Alto, California
4. Penn State Sleep Research and Treatment Center, Hummelstown, Pennsylvania
5. Johns Hopkins School of Medicine, Baltimore, Maryland
6. Oregon Institute of Occupational Health Sciences, Oregon Health and Science University, Portland, Oregon
7. Concentra, Inc., Grand Rapids, Michigan
8. University of Washington Medicine Sleep Disorders Center and Department of Neurology, University of Washington, Seattle, Washington