Smith, Wayne
Malan, Nicolaas T
Schutte, Aletta E
Schutte, Rudolph
MC Mels, Catharina
Vilser, Walthard
Malan, Leone
Article History
Received: 20 December 2015
Revised: 25 February 2016
Accepted: 5 April 2016
First Online: 18 May 2016
Change Date: 14 January 2016
Change Type: Correction
Change Details: This article has been corrected since Advance Online Publication, and a corrigendum is also printed in this issue.
Competing interests
: WV is the managing director of IMEDOS Systems UG.
Free to read: This content has been made available to all.