[1] Los Angeles Cty Dept Publ Hlth, Div Chron Dis & Injury Prevent, 3530 Wilshire Blvd,Suite 800, Los Angeles, CA 90010 USA
[2] Kaiser Permanente Res & Evaluat, Pasadena, CA USA
[3] RAND Corp, Santa Monica, CA USA
[4] Univ Calif Los Angeles, Dept Epidemiol, Fielding Sch Publ Hlth, Los Angeles, CA USA
[5] Univ Calif Los Angeles, David Geffen Sch Med, Dept Family Med, Los Angeles, CA 90095 USA
[6] Univ Calif Los Angeles, Populat Hlth Program, Clin & Translat Sci Inst, Los Angeles, CA USA