Funding for this research was provided by:
National Research Foundation (99210)
Text and Data Mining valid from 2019-07-11
Received: 9 November 2018
Accepted: 26 June 2019
First Online: 11 July 2019
Ethics approval and consent to participate
: This research was granted Ethical Clearance by the University of South Africa (reference number 2018/03/14/90291786/28/MC), which includes permission to publish the results of the research, as reported in this article.
: Not applicable, the manuscript does not contain any person's data in any form.
: The author does not have any competing interests to report.