Funding for this research was provided by:
Bill and Melinda Gates Foundation (INV-006966)
Received: 25 January 2021
Accepted: 10 August 2021
First Online: 21 August 2021
: Ethical approval for the study that produced the data used in this secondary analysis was obtained from the Institutional Review Boards of Johns Hopkins School of Public Health and Excellence in Research Ethics and Science (ERES) Converge in Zambia.
: Not applicable.
: The authors declare that they have no competing interests.