[1] Univ Cape Town, Fac Hlth Sci, Sch Publ Hlth, Vaccines Africa Initiat, Cape Town, South Africa
[2] Univ Western Australia, Telethon Kids Inst, Perth, WA, Australia
[3] Univ Western Australia, Sch Biol Sci, Perth, WA, Australia
[4] Kumasi Ctr Collaborat Res Trop Med, Global Hlth & Infect Dis Res Grp, Kumasi, Ghana
[5] Bernhard Nocht Inst Trop Med, Dept Implementat Res, Res Grp Global One Hlth, Hamburg, Germany
[6] Teaching Hosp, Kathmandu Med Coll, Dept Pediat, Kathmandu, Nepal
[7] London Sch Hyg & Trop Med, MRC Unit Gambia, Vaccines & Immun Theme, Fajara, Gambia
[8] Fac Epidemiol & Populat Hlth, London Sch Hyg & Trop Med, Dept Infect Dis Epidemiol, London, England