1. U.S. Department of Veteran Affairs, VA Boston Healthcare System, 150 S Huntington Ave, Boston, MA 02130;
2. Department of Psychiatry, Boston University Chobanian & Avedisian School of Medicine, 72 E Concord St, Boston, MA 02118;
3. U.S. Department of Veteran Affairs, Minneapolis VA Healthcare System, One Veterans Drive, Minneapolis, MN 55417;
4. National Center for PTSD, Behavioral Science Division, VA Boston Healthcare System, 150 S Huntington Ave, Boston, MA 02130;
5. U.S. Department of Veterans Affairs, Boston Vet Center, 7 Drydock Ave, Boston, MA 02210;
6. Boston University School of Public Health, 715 Albany St, Boston, MA 02118