Funding for this research was provided by:
University of Cape Town (2015/140)
ARISE-ACP scholarship (UCT/2014)
Received: 13 March 2019
Accepted: 22 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: Written consent was obtained from all study participants or their guardians (for those under the age of 18 years). Ethics approval to conduct this study was obtained from Higher Research and Ethics Committee of the University of Cape Town, Faculty of Health Sciences (HREC 014/2015).Research was conducted in compliance with the Helsinki declaration.
: Not applicable.
: The authors declare that they have no competing interests.