Funding for this research was provided by:
Bill and Melinda Gates Foundation (OPP1177824, INV-005121, OPP1184344, INV-008412, INV-001785)
Biotechnology and Biological Sciences Research Council (BB/S01375X/1, BB/S00243X/1, BB/P005888/1)
Received: 14 October 2021
Accepted: 3 January 2022
First Online: 24 January 2022
: As this study was a secondary analysis of aggregated programme data which was not personally identifiable, ethics approval was not required.
: Not applicable.
: The authors declare that they have no competing interests.