Text and Data Mining valid from 2018-04-17
First Online: 17 April 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: The study received ethical clearance from the University of KwaZulu-Natal Biomedical Research Ethics Committee (HSS/0959/013PD) and the Kwazulu-Natal Department of Basic Education. Participation was voluntary and participants were fully informed about the study and signed informed consent forms.