Funding for this research was provided by:
Faculty Research Committee (FRC) Individual Research grant (001.283.8491103.5121105.000000.0000000000.4550)
Text and Data Mining valid from 2019-09-13
Received: 17 July 2019
Accepted: 6 September 2019
First Online: 13 September 2019
Ethics approval and consent to participate
: This study has been approved by the Human Research Ethics Committee of the University of the Witwatersrand (Certificate Number M170829). Written, informed consent, assent and permission will be obtained from the necessary parties.
: Not applicable.
: The authors declare that they have no competing interests.