Published on in Vol 8, No 6 (2020): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/17872, first published
.

1 School of Computing and Communications, The Open University , Milton Keynes , GB
2 Cardiff and Vale University Health Board , Cardiff , GB
3 Biomechanics and Bioengineering Research Centre Versus Arthritis, Cardiff University , Cardiff , GB
4 School of Healthcare Sciences, College of Biomedical and Life Sciences, Cardiff University, Cardiff , GB
5 Knowledge Media Institute, The Open University , Milton Keynes , GB