Barnhoorn, Irene http://orcid.org/0000-0002-6635-304X
van Dyk, Cobus
Funding for this research was provided by:
University of Venda (P309)
National Research Foundation
Article History
Received: 1 March 2020
Accepted: 29 June 2020
First Online: 3 July 2020
Compliance with ethical standards
: Ethical approval was obtained from the Ethics Committee of the Faculty of Science of the University of Johannesburg (REF: 2013-04-26/van Dyk).