Funding for this research was provided by:
National Institute for Communicable Diseases (Internally funded)
Text and Data Mining valid from 2019-02-13
Received: 30 May 2018
Accepted: 8 February 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: Ethics clearance for this study was obtained from the Human Research Ethics Committee (Medical) of the University of the Witwatersrand [Clearance no. M150528]. All study participants provided written consent for their specimens to be used for future research.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.