Funding for this research was provided by:
Bill and Melinda Gates Foundation
Department for International Development, UK Government
Medical Research Council
Received: 22 May 2018
Accepted: 6 September 2018
First Online: 22 October 2018
Ethics approval and consent to participate
: Ethics approvals for the study were obtained from the relevant national research ethics committees in the study countries. Ethics approval numbers: 007 (25th May 2010; Benin); 102/CNE/SE/09 (Cameroon); ECR/NIMR/EC/2010/75 (India); SSC/ERC No.1677 (Kenya); 116-12-09 (Sudan).
: Not applicable.
: The authors declare that they have no competing interests.
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