1. National Center for PTSD, VA Boston Healthcare System, Boston, MA, USA
2. Department of Psychiatry, Boston University School of Medicine, Boston, MA, USA
3. Department of Psychology, University of California, Los Angeles, CA, USA
4. Department of Psychology, University of Memphis, TN, USA
5. Department of Psychiatry and Epidemiology, Boston University School of Public Health, Boston, MA, USA
6. National Center for PTSD, VA Palo Alto Healthcare System, Palo Alto, CA, USA