[1] Univ Massachusetts, Sch Med, Dept Pediat, Worcester, MA 01655 USA
[2] George Washington Univ, Sch Publ Hlth, Dept Prevent & Community Hlth, Washington, DC USA
[3] San Mateo Cty Hlth Syst, San Mateo, CA USA
[4] Stanford Univ, Div Infect Dis, Stanford, CA 94305 USA
[5] Univ Arkansas Med Sci, Dept Biostat, Little Rock, AR 72205 USA
[6] NIAID, NIH, Bethesda, MD 20892 USA
[7] FHI360, Durham, NC USA
[8] Univ Calif Berkeley, Div Epidemiol, Berkeley, CA 94720 USA
[9] Johns Hopkins Univ, Dept Med, Div Infect Dis, Baltimore, MD USA