Funding for this research was provided by:
Medical Research Council (LSHTM PhD Studentship Doctoral Training Programme)
Received: 15 April 2020
Accepted: 30 July 2020
First Online: 25 September 2020
Ethics approval and consent to participate
: This study was approved by The Gambia Government/MRC Joint Ethics Committee (SCC1318). Verbal consent was first obtained at village sensitisation meetings, followed by individual written informed consent for all participants. Parents/guardians provided written consent for children less than 17 years, and assent was obtained from children between 12 and 17 years.
: Not applicable
: All authors declare no competing interests.