1. Mount Sinai Medical Center, New York, NY
2. Barrow Neurological Institute/Saint Joseph's Hospital and Medical Center, Phoenix, AZ
3. Boston University School of Medicine, Boston, MA
4. Cincinnati Veterans Affairs Medical Center, Cincinnati, OH
5. Sleep Medicine Section, John D. Dingell VA Medical Center, Detroit, MI
6. Penn State University Milton S. Hershey Medical Center, Hershey, PA and University of Louisville School of Medicine, Louisville, KY
7. Mayo Clinic, Rochester, MN
8. University of Pittsburgh, Pittsburgh, PA