1. Washington University Sleep Center, St. Louis, Missouri
2. Carolinas Healthcare Medical Group Sleep Services, Charlotte, North Carolina
3. University of Pittsburgh, Pittsburgh, Pennsylvania
4. Division of Pulmonary and Critical Care Medicine, Center for Sleep Medicine, Mayo Clinic, Rochester, Minnesota
5. Johns Hopkins School of Medicine, Baltimore, Maryland
6. Saint Thomas Medical Partners - Sleep Specialists, Nashville, Tennessee
7. University of Michigan Sleep Disorders Center, Ann Arbor, Michigan
8. Veterans Affairs Greater Los Angeles Healthcare System, North Hills, California
9. David Geffen School of Medicine at the University of California, Los Angeles, California
10. Department of Pediatrics, Case Western Reserve University, University Hospitals - Cleveland Medical Center, Cleveland, Ohio
11. Wayne State University, Detroit, Michigan
12. Division of Sleep Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania