[1] VA Boston Healthcare Syst, Natl Ctr PTSD, Boston, MA USA
[2] Boston Univ, Chobanian & Avedisian Sch Med, Boston, MA USA
[3] Johns Hopkins Univ, Sch Nursing, Baltimore, MD USA
[4] VA Boston Healthcare Syst, Natl Ctr PTSD, 150 South Huntington Ave, Boston, MA 02130 USA