Withdrawal Study to Demonstrate the Maintenance Effect in the Treatment of Non-24-Hour Sleep-Wake Disorder

New York Eye and Ear Infirmary, New York

Consolidated Clinical trials, Pittsburgh

Mercy Fitzgerald Hospital - Sleep Disorders Center (Philadelphia Metropolitan Area), Lafayette Hill

The Center for Sleep and Wake Disorders (Washington, D.C. Metropolitan Area), Chevy Chase

SleepMed, Inc. - Columbia, Columbia

Sleep Disorders Center Of Georgia, Atlanta

Ocean Sleep Disorders Center - Ormond Beach, Ormond Beach

Kendall South Medical Center, Inc., Miami

PAB Clinical Research Inc., Brandon

Ohio Sleep Medicine Institute (Columbus Metropolitan Area), Dublin

Michigan Head-Pain Neurological Institute, Ann Arbor

Suburban Lung Associates SC, Elk Grove Village

St. Luke's Sleep Medicine and Research Center (St. Louis Metropolitan Area), Chesterfield

Lynn Health Science Institute, Oklahoma City

Todd J. Swick, M.D., P.A., Houston

Radiant Research - Denver, Denver

Pulmonary Associates, PA, Phoenix

St. Johns Sleep Disorder Center - St. Johns Medical Plaza, Santa Monica

SDS Clinical Trials Inc., Orange

VA Palo Alto Health Care System/PAIRE (San Fransisco Bay Area), Palo Alto

Columbia Research Group Inc., Portland

Brigham and Women's Hospital, Boston