Funding for this research was provided by:
National Research Foundation of South Africa
University of the Witwatersrand
Poliomyelitis Research Foundation
Deutsche Forschungsgemeinschaft (DFG; German Research Foundation) of the special African–German collaborative programme, “Africa Initiative” (GL595/3-1, GL595/3-1, GL595/3-1, GL595/3-1)
Cancer Association of South Africa
Received: 20 July 2022
Accepted: 17 October 2022
First Online: 14 November 2022
: Research was conducted according to the guiding principles of the Declaration of Helsinki. Written informed consent to participate in this study was obtained. Ethical approval (3-10-2016) was obtained from the National Health Research Ethics Committee, Federal Ministry of Health in Sudan. Correspondingly, the study was approved by the University of the Witwatersrand Human Research Ethics Committee, with (Medical) Clearance Certificate No. M170165.
: Not applicable.
: The results presented in this paper have not been published previously in whole or part, except in abstract format. No conflicts of interest to declare.