Funding for this research was provided by:
National Research Foundation (443920 HUB 1138)
Deutscher Akademischer Austauschdienst
Received: 4 April 2018
Accepted: 15 June 2018
First Online: 10 July 2018
Ethics Approval and Consent to Participate
: The study was approved by the Human Research Ethics Committee of the University of Cape Town (Reference number 092/2016), and all participants signed appropriate informed consent forms.
: Not applicable
: The authors, Andreas Venhorst, Dominic P. Micklewright, and Timothy D. Noakes, declare that they have no competing interests.
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