[1] Univ Chicago, Pritzker Sch Med, Chicago, IL 60637 USA
[2] Univ Toronto, Factor Inwentash Fac Social Work, Toronto, ON, Canada
[3] Stanford Univ, Dept Psychiat & Behav Sci, Stanford, CA 94305 USA
[4] Vet Affairs Palo Alto Healthcare Syst, Natl Ctr PTSD, Palo Alto, CA USA
[5] Univ Chicago, Sect Gen Internal Med, Med, Chicago, IL 60637 USA
[6] Univ Chicago, Ctr Hlth & Social Sci, Chicago, IL 60637 USA