Received: 24 February 2020
Accepted: 17 June 2020
First Online: 30 July 2020
Ethics Approval and Consent to Participate
: This study was approved by the Wits-Human Research Ethics Committee, Reference Number of Approval: M190761. All procedures performed in this study were in accordance with the ethical standards of the Wits-Human Research Ethics Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This was a retrospective study using patients records so consent to participate is not applicable.
: Not applicable.
: The authors declare that they have no competing interests.