1. Johns Hopkins School of Medicine, Baltimore, Maryland
2. University of Missouri, Columbia, Missouri
3. Stanford Center for Sleep Sciences and Medicine, Stanford University, Palo Alto, California
4. David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California
5. VA Greater Los Angeles Healthcare System, Geriatric Research, Education and Clinical Center, Los Angeles, California
6. American Academy of Sleep Medicine, Darien, Illinois
7. Saint Thomas Medical Partners-Sleep Specialists, Nashville, Tennessee