Funding for this research was provided by:
Centers for Disease Control and Prevention (U2G/PS001081)
Article History
Received: 12 December 2018
Accepted: 16 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: Ethical approval was obtained from Biomedical Ethics Review Committee at the University of KwaZulu-Natal (KZN), World Health Organisation and the University of California, San Franscisco. Permission to undertake the study was obtained from the KZN Department of Health (DoH).
: Not applicable.
: The authors declare that they have no competing interests.