Funding for this research was provided by:
UK Medical Research Council, Economic and Social Research Council, DFID and Wellcome Trust (MR/R013667/1)
Received: 14 September 2020
Accepted: 6 January 2021
First Online: 19 January 2021
Ethics approval and consent to participate
: Research authorized by the ethics committees of Universidad de Los Andes, Colombia and of University of York, UK.
: Not applicable.
: The authors declare that they have no competing interests.