Funding for this research was provided by:
Bill and Melinda Gates Foundation
Received: 17 August 2020
Accepted: 12 March 2021
First Online: 20 March 2021
: Since publicly available data was used, the project received an “Exempt” status from the North Texas Regional Institutional Review Board, Fort Worth, TX.
: Not applicable.
: The authors declare that they have no competing interests.