1. Wake Forest University Health Sciences, Winston-Salem, NC, USA
2. Pacific Sleep Medicine Services, Inc. San Diego, CA, USA
3. Duke University Medical Center, Psychiatry and Behavioral Sciences, Durham, NC, USA
4. Northside Hospital, Atlanta, GA, USA
5. Tristate Sleep Disorders Center, Cincinnati, OH, USA
6. Columbia University College of Physicians and Surgeons, New York, NY, USA
7. Sepracor Inc., Marlborough, MA, USA