1. National Center for PTSD Veterans Affairs Palo Alto Health Care System, Palo Alto California USA
2. Department of Psychiatry and Behavioral Sciences Stanford University School of Medicine, Stanford California USA
3. Corporal Michael J. Crescenz VA Medical Center, Philadelphia Pennsylvania USA
4. Perelman School of Medicine University of Pennsylvania, Philadelphia Pennsylvania USA
5. Center for Chronic Disease Outcomes Research Minneapolis VA HealthCare System Minneapolis Minnesota USA
6. Department of Psychiatry and Behavioral Sciences University of Minnesota Medical School Minneapolis Minnesota USA