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Article History
Received: 16 November 2018
Accepted: 14 November 2019
First Online: 8 January 2020
Competing interests
: This study was funded by the Bill & Melinda Gates Foundation. Co-authors employed by the Bill & Melinda Gates Foundation provided feedback on initial maps and drafts of this manuscript. Otherwise, the funders of the study had no role in study design, data collection, data analysis, data interpretation, writing of the final report, or the decision to publish. The corresponding author had full access to all the data in the study and had final responsibility for the decision to submit for publication.