1. Department of Psychiatry and Behavioral Sciences, University of Texas Health Science Center at San Antonio, San Antonio, Texas;
2. Department of Psychology, University of North Texas, Denton, Texas;
3. Department of Epidemiology and Biostatistics, University of Texas Health Science Center at San Antonio, San Antonio, Texas;
4. Department of Medicine, Carl R. Darnall Army Medical Center, Fort Hood, Texas;
5. Department of Psychology, University of Texas at San Antonio, San Antonio, Texas;
6. Massachusetts Veterans Epidemiological Research and Information Center VA Boston Healthcare System, Boston, Massachusetts;
7. Department of Psychiatry, Boston University School of Medicine, Boston, Massachusetts;
8. Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts;
9. Research and Development Service, South Texas Veterans Health Care System, San Antonio, Texas