Funding for this research was provided by:
UK Research and Innovation (MR/R018464/1)
Received: 4 March 2021
Accepted: 21 June 2021
First Online: 9 July 2021
: Ethics approval was obtained from the South African Medical Research Council (EC 012-8/2018), the University of Cape Town Human Research Ethics Committee (Reference number: 390/2012) and the London School of Hygiene and Tropical Medicine (Reference: 17873). Informed consent was obtained from parents of adolescents younger than 18 years of age and informed assent/consent from all adolescent participants prior to participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.