Received: 4 November 2022
Accepted: 28 March 2023
First Online: 5 April 2023
: Ethical approval was obtained from the UKHSA Research Support and Governance Office (R&D 474) and London School of Hygiene & Tropical Medicine Ethics Review Committee (ref:22657). Informed consent was obtained from parents of children in school years 0–11 and from children in school years 12 to 13. The study was performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.