Funding for this research was provided by:
Harry Crossley Foundation
National Research Foundation (CPR20110614000019421)
National Institute of Allergy and Infectious Diseases (U19 AI53217)
National Institutes of Health (NIH R01HD071664, R21MH096559)
Received: 25 February 2019
Accepted: 8 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: Ethics approval for the study was obtained from ethics boards of all institutions involved. Consent from caregivers and parents were obtained for all children involved in the study. Health research Ethics Committee (HREC) Stellenbosch University. Ethics reference nr’s: N07/09/208; N05/05/092.
: No individual person’s data contained in the manuscript. Not applicable.
: The authors declare that they have no competing interests in this section.