Funding for this research was provided by:
Bill and Melinda Gates Foundation (OPP: 1148464)
Article History
Received: 1 August 2019
Accepted: 17 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board at Duke University (DUKE Campus IRB: 2017–1359). Informed consent was obtained from each interviewee before the starting of the interview process.
: Not applicable.
: The authors declare that they have no competing interests.