1. National Center for PTSD, Behavioral Science Division, VA Boston Healthcare System, 150 South Huntington Avenue, Boston, MA 02130, USA
2. VA Boston Healthcare System, 150 South Huntington Avenue, Boston, MA 02130, USA
3. Department of Psychiatry, Boston University School of Medicine, 720 Harrison Avenue, Room 906 Boston, MA 02118, USA
4. Edith Nourse Rogers Memorial Veterans Hospital, 200 Springs Road Bedford, MA 01730, USA
5. VA Palo Alto Health Care System, 3801 Miranda AvenuePalo Alto, CA 94304, USA
6. Stanford University School of Medicine, Stanford University, 291 Campus Drive, Stanford, CA 94305, USA