Statement of ethics
The study was approved by the University of the Witwatersrand Human
Research Ethics Committee (HREC Medical); R14/49, Certificate number:
M…… 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. Patient informed consent was obtained for publication and is
available on request.