Published on in Vol 8, No 3 (2019): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9228, first published
.

1 Research and Innovation, Portsmouth Hospitals NHS Trust , Portsmouth , GB
2 School of Health Sciences and Social Work, University of Portsmouth , Portsmouth , GB
3 Stats Consultancy , Amersham , GB