Published on in Vol 10, No 7 (2021): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/27227, first published
.

1 Ufonia Ltd , Oxford , GB
2 Centre for Health Technology, University of Plymouth , Plymouth , GB
3 Imperial College London , London , GB
4 University of Oxford , Oxford , GB
5 Department of Primary Care and Public Health, Imperial College London , London , GB