1. Veterans Integrated Service Network, Mental Illness Research, Education and Clinical Center, Philadelphia V.A. Medical Center, Philadelphia, Pennsylvania
2. Center for Sleep and Respiratory Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
3. Treatment Research Center‐Center for Study on Addictions, University of Pennsylvania, Philadelphia, Pennsylvania
4. Pulmonary, Critical Care and Sleep Section, Philadelphia V.A. Medical Center, Philadelphia, Pennsylvania
5. Department of Psychology, Virginia Commonwealth University, Richmond, Virginia
6. Section of Geriatric Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania