[1] VA Boston Healthcare Syst, Natl Ctr Posttraumat Stress Disorders, Dept Vet Affairs, Boston, MA 02130 USA
[2] Boston Univ, Sch Med, Dept Psychiat, Boston, MA 02118 USA
[3] Univ S Carolina, Dept Psychol, Aiken, SC USA
[4] VA Environm Epidemiol Serv, Washington, DC USA
[5] Boston Univ, Sch Publ Hlth, Dept Hlth Policy & Management, Boston, MA USA