Funding for this research was provided by:
Sefako Makgatho Health Sciences University (D105 MODJADJI RDG)
Received: 17 May 2019
Accepted: 31 July 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki [CitationRef removed] and all procedures involving human subjects were approved by Sefako Makgatho Health Sciences University Research and Ethics Committee (SMUREC) [SMUREC/H/161/2016: PG]. Furthermore, this study received permission from the Department of Education, Limpopo Province, South Africa. The nature of the study was explained to the mothers of the children prior to their participation. Written informed consent was obtained from mothers and verbal assent from children.
: Not applicable.
: Perpetua Modjadji declares that she has no competing interest related to this study. Sphiwe Madiba is an Associate Editor for BMC Public Health journal. She declares that she has no competing interest associated with this study and did not influence the review process.