1. Duke University School of Medicine, Durham, NC
2. College of Physicians and Surgeons, Columbia University, New York, NY, Clinilabs Sleep Disorders Institute, New York, NY, Clinilabs Sleep Disorders Institute, New York, NY
3. Rush University. Chicago, IL
4. Arizona Respiratory Center, University of Arizona College of Medicine, Tucson, AZ
5. Brigham and Women's Hospital, Boston, MA
6. Harvard Medical School, Boston, MA
7. Veterans Administration Hospital, Durham, NC
8. Philips Respironics
9. R.P. Chiacchierini & Associates, Rockville, MD