Funding for this research was provided by:
Centers for Disease Control and Prevention (U48DP001944, 200-2015-M-63021)
National Institutes of Health (1K01-TW009657-01, P30-AI50410)
Bill and Melinda Gates Foundation (OPP1090837)
Received: 3 March 2020
Accepted: 22 February 2021
First Online: 20 March 2021
: Ethical approval was obtained from the National Health Sciences Research Committee of Malawi (#1182), the University of North Carolina School of Medicine Institutional Review Board (#13-1891), the US Centers for Disease Control and Prevention (#6512), and the Malawi Pharmaceuticals, Medicines and Poisons Board (PMPB/CTRC/III/2402201460). Women gave written informed consent at the time of enrolment in Chichewa.
: Not applicable.
: The authors declare that they have no competing interests.