Bernitz, Herman
van Staden, Paul Jacobus
Rossouw, Servaas Hofmeyr
Jordaan, Joyce
Article History
Received: 6 October 2018
Accepted: 5 December 2018
First Online: 14 December 2018
Compliance with ethical standards
: The research project was approved by the ethics committee of the Faculty of Health Sciences, University of Pretoria and is in accordance with the 1964 Declaration of Helsinki.