1. Sleep Disorders Center, Walter Reed National Military Medical Center, Bethesda, Maryland
2. Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland
3. Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, Maryland
4. Sleep Disorders Clinic, Department of Medicine, Womack Army Medical Center, Fort Bragg, North Carolina
5. Department of Neurology, Uniformed Services University of the Health Sciences, Bethesda, Maryland
6. Department of Neurology, Walter Reed National Military Medical Center, Bethesda, Maryland
7. Department of Sleep Medicine, San Antonio Military Medical Center, San Antonio, Texas
8. Department of Medicine, Uniformed Services University of the Health Sciences, Uniformed Services University of the Health Sciences, Bethesda, Maryland