Funding for this research was provided by:
North-West University, South Africa
Text and Data Mining valid from 2018-12-06
Received: 16 July 2018
Accepted: 28 October 2018
First Online: 6 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All applicable institutional, national and international guidelines for the care and use of animals were followed.