1. Sleep Disorders and Research Center, Henry Ford Hospital, Detroit, MI
2. Sleep Unit, University Hospital, Gui de Chauliac, Montpellier, France
3. Stanford Center for Sleep Sciences, Stanford University, Palo Alto, CA
4. Center for Advanced Studies in Sleep Medicine, Hôpital de Sacré-Cœur de Montréal, Centre d'étude du sommeil, Montréal, Québec, Canada
5. Paul Scientific Communications, New York, NY
6. The Houston Sleep Center, University of Texas-Houston School of Medicine, Houston, TX
7. Sleep Disorders Center, Northwestern University, Chicago, IL