1. Center for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland
2. Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts
3. Department of Psychology, Harvard University, Cambridge, Massachusetts
4. Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, Maryland
5. University of Michigan Institute for Social Research, Ann Arbor
6. Department of Psychiatry, University of California San Diego, La Jolla
7. Department of Family Medicine and Public Health, University of California San Diego, La Jolla
8. Veterans Affairs San Diego Healthcare System, San Diego, California