1. VISN 20 Mental Illness Research, Education and Clinical Center, Seattle, Washington
2. Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, Washington
3. Department of Neurology, University of Washington School of Medicine, Seattle, Washington
4. VA Portland Health Care System, Research Service, Portland, Oregon
5. Oregon Health and Science University, Neurology, Portland, Oregon
6. Oregon Health and Science University, Behavioral Neuroscience, Portland, Oregon
7. Oregon Health and Science University, Division of Pulmonary and Critical Care Medicine, Portland, Oregon
8. Oregon Health and Science University, Oregon Institute of Occupational Health Sciences, Portland, Oregon