1. San Francisco VA Health Care System, San Francisco, CA, USA
2. Department of Psychiatry and Behavioral Sciences, School of Medicine, University of California at San Francisco, San Francisco, CA, USA
3. Epidemiology Program, Health Outcomes of Military Exposures, US Department of Veterans Affairs, Washington, DC, USA
4. Rocky Mountain Mental Illness Research, Education, and Clinical Center, US Department of Veterans Affairs, Aurora, CO, USA
5. Department of Physical Medicine and Rehabilitation, University of Colorado School of Medicine, Aurora, CO, USA