1. Mental Health Service; Ralph H. Johnson VA Medical Center; Charleston South Carolina USA
2. Department of Psychiatry; Medical University of South Carolina; Charleston South Carolina USA
3. Seattle Epidemiologic Research and Information Center; VA Puget Sound Health Care System; Seattle Washington USA
4. Department of Epidemiology; University of Washington; Seattle Washington USA
5. National Center for Posttraumatic Stress Disorder; Department of Veterans Affairs; White River Junction Vermont USA
6. Departments of Psychiatry and Pharmacology & Toxicology; Geisel School of Medicine at Dartmouth; Hanover New Hampshire USA
7. Massachusetts Epidemiology Research and Information Center; VA Boston Healthcare System; Boston Massachusetts USA
8. Boston University School of Medicine; Boston Massachusetts USA
9. Department of Epidemiology; Emory University; Atlanta Georgia USA
10. Department of Medicine; Emory University; Atlanta Georgia USA
11. Department of Biostatistics; University of Washington; Seattle Washington USA
12. Cooperative Studies Program; Clinical Science Research and Development, VA Office of Research and Development; Washington DC USA