1. Gavi, the Vaccine Alliance , Chem. du Pommier 40, 1218 Le Grand-Saconnex, Geneva , Switzerland
2. United Nations Children's Fund (UNICEF), Country Office , Yaoundé , 335 Rue 1810, Cameroon
3. Clinton Health Access Initiative Inc. , Yaoundé, P.O. Box 2664 , Cameroon
4. Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford , Oxford, OX3 7LF , UK
5. Faculty of Medicine and Biomedical Sciences, University of Yaoundé 1 , Yaoundé , P.O. Box 1364, Cameroon
6. School of Global Health and Bioethics, Euclid University , Bangui, P.O. Box 157 , Central African Republic
7. Department of Studies and Projects, Ministry of Public Health , Yaoundé , P.O. Box 1937, Cameroon