Hamer, M
Bruwer, E J
de Ridder, J H
Swanepoel, M
Kengne, A P
Cockeran, M
Malan, L http://orcid.org/0000-0003-3187-2410
Article History
Received: 7 October 2016
Revised: 11 November 2016
Accepted: 23 November 2016
First Online: 26 January 2017
Competing interests
: The authors declare no conflict of interest.