Funding for this research was provided by:
South African Medical Research Council (SAMRC-RFA-UFSP-01-2013/STEM CELLS)
Text and Data Mining valid from 2019-08-14
Received: 15 June 2019
Revised: 31 July 2019
Accepted: 1 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: Signed informed consent was obtained prior to the procedure and approval for the study was granted by the University of Pretoria Health Sciences Research Ethics Committee (approval number 421/2013).
: Not applicable.
: The authors declare that they have no competing interests.