1. University of Washington Sleep Disorders Center, University of Washington, Seattle, WA
2. Mayo Center for Sleep Medicine, Mayo Clinic, Rochester, MN
3. University of Michigan Sleep Disorders Center, University of Michigan, Ann Arbor, MI
4. Saint Thomas Sleep Specialists, Nashville, TN
5. Carolinas Healthcare Medical Group Sleep Services, Charlotte, NC
6. University of Pittsburgh, Pittsburgh, PA
7. SLUCare Sleep Disorders Center, Saint Louis University, St. Louis, MO
8. Department of Neurology, Saint Louis University, St. Louis, MO
9. Veteran Affairs Greater Los Angeles Health System, North Hills, CA
10. Division of Pulmonary/Sleep/Critical Care, Mayo Clinic, Rochester, MN
11. Penn Sleep Center, Philadelphia, PA
12. Center for Sleep, Philadelphia, PA
13. College of Nursing, University of Illinois at Chicago,Chicago, IL
14. Methodist Healthcare Sleep Disorders Center, Memphis, TN