Funding for this research was provided by:
Bill and Melinda Gates Foundation (OPP1017031)
Received: 12 May 2020
Accepted: 19 November 2020
First Online: 30 November 2020
Ethics approval and consent to participate
: Study protocols were reviewed and approved by the London School of Hygiene & Tropical Medicine Ethics Committee, the Ministry of Science and Technology in Ethiopia, the National Research Ethics Committee in Nigeria and the Gombe State Government in Nigeria. Written consent was obtained from all participants; illiterate participants were asked to appoint a proxy to sign on their behalf. A copy of the consent forms can be found in the supplementary files.All data were anonymized for publication.
: Not applicable.
: The authors declare that they have no competing interests.