1. Center for Health Care Evaluation, VA Palo Alto Health Care System, Menlo Park, Division of General Internal Medicine and Center for Primary Care and Outcomes Research, Stanford University, California,
2. Center for Health Quality, Outcomes & Economic Research, VA Bedford; Boston University School of Public Health, Massachusetts
3. National Center for PTSD, VA Boston Healthcare System, Massachusetts
4. Center for Health Care Evaluation, VA Palo Alto Health Care System, Menlo Park; Division of General Internal Medicine, Stanford University, California
5. University of Alabama, Birmingham
6. Center for Health Quality, Outcomes & Economic Research, VA Bedford, Massachusetts
7. Center for Health Care Evaluation and National Center for PTSD, VA Palo Alto Health Care System, Menlo Park, California
8. National Center for PTSD, VA Boston Healthcare System; Boston University School of Medicine, Massachusetts