Funding for this research was provided by:
Bill and Melinda Gates Foundation
Text and Data Mining valid from 2020-08-11
Version of Record valid from 2020-08-11
Article History
Received: 18 March 2020
Accepted: 22 July 2020
First Online: 11 August 2020
Ethics approval and consent to participate
: Not applicable
: Not applicable
: The authors declare that they have no competing interests.