[1] Vanderbilt Inst Global Hlth, Nashville, TN USA
[2] Chinese Ctr Dis Control, Natl Ctr AIDS STD Control & Prevent, State Key Lab Infect Dis Prevent & Control, Beijing, Peoples R China
[3] Vanderbilt Univ, Sch Med, Dept Prevent Med, Nashville, TN 37212 USA
[4] Chongqing Ctr Dis Control & Prevent, Chongqing, Peoples R China
[5] Vanderbilt Univ, Sch Med, Dept Med, Nashville, TN 37212 USA
[6] San Francisco Dept Publ Hlth, San Francisco, CA USA
[7] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[8] Vanderbilt Univ, Sch Med, Dept Pediat, Nashville, TN 37212 USA