[1] Univ Calif Los Angeles, Community Hlth Sci, Fielding Sch Publ Hlth, 650 Charles E Young Dr South, Los Angeles, CA 90095 USA
[2] Univ Calif San Francisco, Dept Epidemiol & Biostat, 550 16th St, San Francisco, CA 94158 USA
[3] Univ Calif San Francisco, Global Hlth Sci, 550 16th St, San Francisco, CA 94158 USA
[4] Univ Calif San Francisco, Sch Med, 550 16th St, San Francisco, CA 94158 USA
[5] Univ Calif San Diego, 9500 Gilman Dr, La Jolla, CA 92093 USA
[6] Asian Hlth Serv, 818 Webster St, Oakland, CA 94607 USA