Funding for this research was provided by:
Medical Research Council (MR/K011944/1)
Fogarty International Center - National Institute of Health (K43TW011125)
Royal Society/African Academy of Science (FLR\R1\191166)
Received: 10 April 2020
Accepted: 22 June 2020
First Online: 2 July 2020
Ethics approval and consent to participate
: This study was approved by the MRC/Gambian government joint ethics committee. Written informed consent was obtained from the parents/guardians of the children prior to inclusion into the study.
: Not applicable.
: The authors declare that they have no competing interests.