Funding for this research was provided by:
University of the Witwatersrand Medical Faculty Research Endowment fund
Article History
Received: 18 May 2018
Accepted: 1 December 2018
First Online: 10 December 2018
Compliance with ethical standards
:
: The authors have nothing to disclose related to the content of this manuscript.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Ethical clearance (clearance number M070452) was obtained from the University of the Witwatersrand Human Research Ethics Committee and participants signed a written informed consent form.