Published on in Vol 7, No 11 (2019): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/14946, first published
.
1 Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom
2 Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, United Kingdom