[1] Los Angeles Cty Dept Publ Hlth, Div Chron Dis & Injury Prevent, Los Angeles, CA 90010 USA
[2] Los Angeles Cty Dept Publ Hlth, Div Chron Dis & Injury Prevent, Los Angeles, CA 90005 USA
[3] Univ Calif Los Angeles, Los Angeles Jonathan & Karin Fielding Sch Publ Hl, Dept Epidemiol, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Dept Family Med, Los Angeles, CA 90024 USA