1. Mental Health Services, Minneapolis Veteran's Affairs (VA) Health Care System, Minneapolis, MN, United States of America
2. Department of Psychiatry and Behavioral Sciences, Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, United States of America
3. Mental Health Services, San Francisco Veteran's Affairs (VA) Health Care System, San Francisco, CA, United States of America
4. Pulmonary and Critical Care, Puget Sound Veteran's Affairs (VA) Health Care System, Seattle, WA, United States of America
5. Division of Pulmonary, Critical Care, and Sleep Medicine, School of Medicine, University of Washington, Seattle, Washington, United States of America
6. Department of Psychiatry, Minnesota Regional Sleep Disorders Center, Minneapolis, MN, United States of America
7. Pulmonary, Allergy, Critical Care and Sleep, Minneapolis Veteran's Affairs (VA) Health Care System, Minneapolis, MN, United States of America
8. Department of Neurology, Medical School, University of Minnesota, Minneapolis, MN, United States of America