Rathebe, Phoka C. http://orcid.org/0000-0001-9095-354X
Article History
Received: 8 February 2021
Accepted: 22 June 2021
First Online: 10 July 2021
Declarations
:
: The author declares no conflict of interest.
: Prior commencement of this study a written informed consent was obtained from two maintenance engineers. Ethical clearance was obtained from the University of the Free State Health Sciences Ethics Committee (Reference Number: UFS-HSD2018/0438/3107).