1. VA Boston Healthcare System, Center for Healthcare Organization and Implementation Research (CHOIR) , Boston, MA 02130, USA
2. Department of Psychiatry, Harvard Medical School , Boston, MA 02115, USA
3. VA Boston Healthcare System, National Center for PTSD (116B-2) , Boston, MA 02130, USA
4. Boston VA Research Institute (BVARI) , Boston, MA 02130, USA
5. Emmanuel College , Boston, MA 02115, USA
6. Department of Psychiatry, Boston University Chobanian & Avedisian School of Medicine , Boston, MA 02118, USA