1. National Center for PTSD, VA Boston Healthcare System, Boston, Massachusetts, USA
2. Department of Psychiatry, Boston University School of Medicine, Boston, Massachusetts, USA
3. MAVERIC, VA Boston Healthcare System, Boston, Massachusetts, USA
4. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts, USA
5. RTI International, Waltham, Massachusetts, USA
6. Department of Psychology, University of Connecticut, Storrs, Connecticut, USA
7. Health Policy and Management, Mailman School of Public Health, Columbia University, New York, New York, USA