Sleep Initiation and Maintenance Disorders

• Brigham and Women's Hospital — Boston, Massachusetts, United States

• Kaiser Permanente Center for Health Research — Portland, Oregon, United States

• VA Long Beach Healthcare System, Long Beach, CA — Long Beach, California, United States
• San Francisco VA Medical Center, San Francisco, CA — San Francisco, California, United States
• Salisbury W.G. (Bill) Hefner VA Medical Center, Salisbury, NC — Salisbury, North Carolina, United States
• Ralph H. Johnson VA Medical Center, Charleston, SC — Charleston, South Carolina, United States

• CHU de NIMES — Nîmes, France

• University of Virginia — Charlottesville, Virginia, United States

• University of Arizona — Tucson, Arizona, United States

• University of Pennsylvania — Philadelphia, Pennsylvania, United States

• San Francisco VA Medical Center, San Francisco, CA — San Francisco, California, United States

Not specified

• Catholic Kwandong University International St. Mary's Hospital — Incheon, South Korea
• CHA Bundang Hospital — Seongnam-si, South Korea
• Seoul National University Hospital, Seoul, 03080 — Seoul, South Korea