Text and Data Mining valid from 2018-07-27
First Online: 27 July 2018
Compliance with Ethical Standards
: The authors have no conflict of interest to declare.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Stellenbosch University’s human research ethics committee approved this study (reference number N11/11/329).
: All caregivers provided written informed consent for their and their child’s participation. In addition, all children (≥ 7 years) provided written informed assent for their participation.