Funding for this research was provided by:
Medical Research Council (NHSP programme)
Received: 16 September 2021
Accepted: 22 July 2022
First Online: 6 August 2022
: Ethical approval was granted by the KZN Health Research and Knowledge Management Directorate of the provincial Department of Health (ref no. HRKM320/15 K2_2015RP40_914) and the Biomedical Research Ethics Committee of the University of KwaZulu-Natal (approval number BFC354/15), in accordance with the Declaration of Helsinki. Research methods were carried out in accordance with these guidelines.Mothers provided informed consent prior to participation.
: Not Applicable.
: The authors declare that they have no competing interests.