Jekel, Charles F.
Venter, Gerhard
Venter, Martin P.
Stander, Nielen
Haftka, Raphael T.
Article History
Received: 3 October 2017
Accepted: 16 May 2018
First Online: 14 July 2018
Compliance with Ethical Standards
:
: The authors declare that there is no conflict of interest.