[1] Univ Calif San Francisco, Dept Social & Behav Sci, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Sch Med, San Francisco, CA 94143 USA
[3] San Francisco Vet Affairs Hlth Care Syst, San Francisco, CA USA
[4] San Francisco Vet Affairs Hlth Care Syst, Operat Enduring Freedom Operat Iraqi Freedom Inte, San Francisco, CA USA