1. VISN17 Center of Excellence for Research on Returning War Veterans, Waco, Texas, USA
2. Epidemiology Program, Louisiana State University School of Public Health, New Orleans, LA, USA
3. Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, Providence, RI, USA
4. Center for Behavioral and Preventive Medicine, The Miriam Hospital, Providence, RI, USA
5. Johns Hopkins Bloomberg School of Public Health
6. Dell Medical School of the University of Texas at Austin