1. North Dakota Center for Sleep, Fargo, North Dakota
2. eviCore Healthcare, Bluffton, South Carolina
3. Greenville Health System, University of South Carolina, Greenville, South Carolina
4. University of Michigan Sleep Disorders Center, Ann Arbor, Michigan
5. Southern California Permanente Medical Group, Kaiser Permanente Fontana Sleep Disorders Center, Fontana, California
6. Cardiovascular Division, Department of Medicine, University of Virginia, Charlottesville, Virginia
7. Department of Medicine, University of Washington, Seattle, Washington
8. Division of Sleep Medicine, Department of Medicine, Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, New York
9. Carolinas Healthcare Medical Group Sleep Services, Charlotte, North Carolina