Lippman, Sheri A.
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机构:
Univ Witwatersrand, Fac Hlth Sci, Sch Publ Hlth, MRC Wits Rural Publ Hlth & Hlth Transit Res Unit, Johannesburg, South Africa
Univ Calif San Francisco, Dept Med, Ctr AIDS Prevent Studies, San Francisco, CA USA Univ Calif San Francisco, Dept Epidemiol & Biostat, Mission Hall,550 16th St, San Francisco, CA 94158 USA