Funding for this research was provided by:
United States Agency for International Development (AID-OAA-A-17-00018)
Received: 20 May 2019
Accepted: 5 November 2019
First Online: 9 January 2020
Ethics approval and consent to participate
: Our study was approved and monitored by two institutional review boards (IRBs), Advarra (US-based) (protocol number 29590) and ERES Converge (based locally in Zambia) (no protocol number). Participants provided informed written consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.