[1] Clinton Hlth Access Initiat Inc, POB 2664, Yaounde, Cameroon
[2] Univ Siena, Inst Global Hlth, I-53100 Siena, Italy
[3] Vaccine Alliance, Gavi, CH-1202 Geneva, Switzerland
[4] Hebrew Univ Jerusalem, Fac Med, Hadassah Braun Sch Publ Hlth & Community Med, IL-91120 Jerusalem, Israel
[5] Cameroon Minist Publ Hlth, Expanded Program Immunizat, POB 2084, Yaounde, Cameroon
[6] Clinton Hlth Access Initiat Inc, Global Vaccine Team, Boston, MA 02127 USA
[7] Euclid Univ, Sch Global Hlth & Bioeth, BP 157, Bangui, Cent Afr Republ
[8] Univ Yaounde I, Fac Med & Biomed Sci, BP 337, Yaounde, Cameroon
[9] WHO, Reg Off Africa, POB 06, Brazzaville, Rep Congo
[10] Univ Siena, Dept Mol Med, Via Aldo Moro 3, I-53100 Siena, Italy
[11] VisMederi srl, Via Ferrini 53, I-53035 Siena, Italy
[12] Univ Oxford, Dept Pediat, Oxford OX1 2JD, England