[1] Boston Univ, Sch Med, Dept Psychiat, Boston, MA 02215 USA
[2] VA Boston Healthcare Syst, Natl Ctr PTSD, Boston, MA USA
[3] Ryerson Univ, Dept Psychol, Toronto, ON, Canada
[4] Vet Affairs Canada, Montreal, PQ, Canada
[5] Vet Affairs VA Palo Alto Healthcare Syst, Natl Ctr Posttraumat Stress Disorder PTSD, Palo Alto, CA USA
[6] Stanford Univ, Dept Psychiat, Menlo Pk, CA 94304 USA