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