Funding for this research was provided by:
Wellcome Trust (210758/Z/18/Z)
Horizon 2020 (101003688)
Received: 9 March 2021
Accepted: 26 August 2021
First Online: 10 September 2021
: Participation in this opt-in study was voluntary, and all analyses were carried out on anonymised data. The study and method of informed consent were approved by the ethics committee of the London School of Hygiene & Tropical Medicine Reference number 21795.
: Not applicable
: The authors declare that they have no competing interests.