1. Stanford University Center of Excellence for Sleep Disorders, Stanford, CA
2. New Jersey Neuroscience Institute at JFK Medical Center, Seton Hall University School of Graduate Medical Education, Edison, NJ
3. Sleep Medicine Associates of Texas, Dallas, TX
4. Pacific Research Network, San Diego, CA
5. Sleep Medicine Program at Raleigh Neurology Associates, Raleigh, NC
6. Henry Ford Hospital, Detroit, MI
7. ARYx Therapeutics, Freemont, CA
8. XenoPort, Inc., Santa Clara, CA