Updates are available Correction dated 2020-08-17

Article History

Received: 4 May 2019

Accepted: 8 October 2019

First Online: 17 June 2020

Change Date: 17 August 2020

Change Type: Correction

Change Details: Unfortunately, the first author name was not included in the author group of original publication.

Compliance with ethical standards

:

: The authors declare that they have no conflict of interest.

: All procedures performed in this study were in accordance with the University of Kwa-Zulu Natal’s Biomedical Research Ethics Committee (BREC) BF293/15, Medical Research Council of Zimbabwe (MRCZ) MRCZ/B/948 and with the 1964 Helsinki declaration as well as its amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.