1. Cleveland Clinic Sleep Disorders Center, Cleveland, OH
2. MetroHealth Medical Center, Case Western Reserve University School of Medicine, Cleveland OH
3. University of California Irvine, Irvine, CA
4. Harborview Medical Center, University of Washington, Seattle, WA
5. University of Minnesota, Minneapolis, MN
6. Northwestern University, Feinberg School of Medicine, Chicago, IL
7. Brigham and Women’s Hospital and Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
8. Case Western Reserve University School of Medicine, Cleveland, OH