[1] VA Boston Healthcare Syst, Natl Ctr PTSD, Boston, MA 02130 USA
[2] Boston Univ, Sch Med, Boston, MA 02215 USA
[3] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[4] Carl R Darnall Army Med Ctr, Ft Hood, TX 76544 USA
[5] Duke Univ, Med Ctr, Durham, NC 27706 USA