Received: 12 August 2020
Accepted: 21 July 2021
First Online: 5 August 2021
: Permission to conduct the research was obtained from NUST while ethical clearance was granted by the Ministry of Health and Social Services (MoHSS), Namibia research committee, reference 17/3/3 EH. Written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.