Published on in Vol 8, No 7 (2019): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13034, first published
.
1 Department of Education, University of Oxford, Oxford, United Kingdom
2 Kellogg College, University of Oxford, Oxford, United Kingdom
3 KEMRI-Wellcome Trust Research Programme, Nairobi, Kenya
4 Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom