Received: 30 October 2019
Accepted: 17 December 2019
First Online: 21 December 2019
Ethics approval and consent to participate
: The Ethics Committee at Mpilo Central Hospital made a ruling for all retrospective studies to go ahead in the institution from 2016 onwards as long as the data remained anonymous. No ethical issues arose during the study as all the data remained anonymous with no identifying personal data. Minutes of the Committee’s inaugural meeting held on the 13th October 2016 set out the requirements of all the studies at the institution. This study was approved by the Medical Research Council Approval Number MRCZ/A/2483 as part of a doctoral research study protocol [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.