Received: 17 July 2018
Accepted: 11 February 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: Participants were informed of the study and all participants’ parents signed a consent form and participants signed an assent form for participation in the study. Participant information was coded to ensure removal of all identifying information for confidentiality and anonymity. Approval was obtained to conduct the research from each area’s Department of Education, and each school signed a consent form in order to participate in the study. The sub-study was approved by the Human Research Ethics Committee of the University of the Witwatersrand (Clearance number M160958).
: Not applicable.
: The authors declare that they have no competing interests.
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