Article History
Received: 28 September 2018
Accepted: 12 November 2018
First Online: 21 November 2018
Compliance with ethical standards
: Ethical approval was obtained from Stellenbosch University Animal Ethics Committee (SU-ACUD15-00114) who followed the South African National Standard (SANS) for the Care and Use of Animals for Scientific Purposes (SANS 10386:2008).
: The authors declare that there is no conflict of interest.