[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Psychiat & Biobehav Sci, Los Angeles, CA 90095 USA
[2] West Los Angeles VA Healthcare Ctr, Los Angeles, CA 90073 USA
[3] UCLA, David Geffen Sch Med, Div Gen Internal Med, Los Angeles, CA 90095 USA
[4] UCLA, Fielding Sch Publ Hlth, Los Angeles, CA 90095 USA
[5] RAND Corp, Santa Monica, CA 90401 USA
[6] RAND Corp, Arlington, VA 22202 USA
[7] Los Angeles Cty Dept Publ Hlth, 313 N Figueroa St, Los Angeles, CA 90012 USA
[8] Loma Linda Univ, Sch Publ Hlth, Loma Linda, CA 92350 USA