[1] Univ Oxford, Dept Paediat, Oxford Vaccine Grp, Oxford, England
[2] Boston Childrens Hosp, Div Infect Dis, Boston, MA USA
[3] Harvard Med Sch, Dept Pediat, Boston, MA USA
[4] Ctr Dis Control & Prevent, Div Global HIV & TB, Atlanta, GA USA
[5] Yale Sch Publ Hlth, Dept Hlth Policy & Management, New Haven, CT USA
[6] Maastricht Univ, MosaKids Childrens Hosp, Dept Pediat, Med Ctr, Maastricht, Netherlands
[7] Kenya Govt Med Res Ctr, Ctr Global Hlth Res, Kisumu, Kenya
[8] Univ Arizona, Coll Med, Tucson, AZ USA