Published on in Vol 23, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/23168, first published
.
1 St George’s University of London, Cranmer Terrace, London, United Kingdom
2 King’s College London, London, United Kingdom
3 Imperial College, London, United Kingdom
4 University College London, London, United Kingdom