Text and Data Mining valid from 2019-07-22
Received: 15 March 2019
Accepted: 17 June 2019
First Online: 22 July 2019
Change Date: 27 August 2019
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
: 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 had no role in study design, data collection, data analysis, data interpretation, writing of the final report, or decision to publish. The corresponding author had full access to all of the data in the study, and had final responsibility for the decision to submit for publication.