Funding for this research was provided by:
Bill and Melinda Gates Foundation (INV-016832, INV-016832, INV-016832, OPP1191821, INV-009125, INV-009125)
Wellcome Trust (208812/Z/17/Z)
Received: 17 May 2021
Accepted: 26 July 2021
First Online: 12 August 2021
: Not applicable.
: BH was employed by the Bill and Melinda Gates Foundation while contributing to this study. MJ is a member of the editorial board of BMC Medicine. The authors declare that they have no competing interests.