1. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
2. Houston VA HSR&D Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey VA Medical Center, Houston, Texas, USA.
3. Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, Texas, USA.
4. VA South Central Mental Illness Research, Education and Clinical Center, Houston, Texas, USA.
5. VA National Center for PTSD, Menlo Park, California, USA.