Published on in Vol 22, No 4 (2020): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15474, first published
.
1 Department of Biostatistics, University of Liverpool, Liverpool, United Kingdom
2 Oxford Trauma, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom