Funding for this research was provided by:
H2020 European Research Council (101003688)
Received: 15 October 2020
Accepted: 21 January 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: Participation in this opt-in study was voluntary, and all analyses were carried out on anonymised data. The study and method of informed consent was approved by the ethics committee of the London School of Hygiene & Tropical Medicine Reference number 21795. The research was conducted in accordance with the Declaration of Helsinki.
: Not applicable
: The authors declare no competing interests.