Funding for this research was provided by:
Bill and Melinda Gates Foundation (OPP1149395)
Received: 1 December 2020
Accepted: 22 February 2021
First Online: 10 March 2021
: The Duke University Institutional Review Board provided ethics approval of the survey (Approval number: 2017-0768). All respondents read a statement that explained the purpose of the study and gave their consent to continue.
: Not applicable.
: The authors report no competing of interest. The authors alone are responsible for the content and writing of this article.