1. Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
2. Deployment Health Research Department, Naval Health Research Center, San Diego, CA
3. Seattle Epidemiologic Research and Information Center, Veterans Affairs Puget Sound Health Care System, Seattle, WA
4. Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, Bethesda, MD
5. Analytic Services, Inc. (ANSER), Arlington, VA
6. Durham VA and Duke University Medical Centers, Durham, NC
7. Department of Deployment Health Research, Naval Health Research Center, San Diego, CA, Department of Community Health, School of Health and Human Services, National University Technology and Health Sciences Center, San Diego, CA