1. Center for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
2. Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. , Bethesda, MD 20817, USA
3. Minneapolis VA Health Care System , Minneapolis, MN 55417, USA
4. Department of Psychiatry, University of Minnesota Medical School , Minneapolis, MN 55454, USA
5. Department of Health Care Policy, Harvard Medical School , Boston, MA 02115, USA
6. Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School , Boston, MA 02114, USA
7. Boston Health Care for the Homeless Program , Boston, MA 02118, USA
8. National Center for PTSD, VA Boston Healthcare System , Boston, MA 02130, USA
9. Department of Psychiatry, Boston University School of Medicine , Boston, MA 02118, USA
10. Department of Health Behavior, School of Public Health, The University of Alabama at Birmingham , Birmingham, AL 35233, USA
11. Birmingham VA Health Care System , Birmingham, AL 35233, USA
12. VA Health Services Research and Development Service , Washington, DC 20571, USA
13. Department of Psychiatry, Yale School of Medicine , New Haven, CT 06511, USA
14. U.S. Department of Veterans Affairs, National Center on Homelessness Among Veterans , Tampa, FL 33637, USA
15. University of Texas Health Science Center at Houston , Houston, TX 77030, USA
16. Department of Psychiatry and School of Public Health, University of California San Diego , La Jolla, CA 92093-0855, USA
17. VA San Diego Healthcare System , San Diego, CA 92161, USA