Published on in Vol 8, No 8 (2019): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13437, first published
.
1 Faculty of Medicine, Imperial College London, London, United Kingdom
2 Department of General Surgery, Royal Infirmary Edinburgh, Edinburgh, United Kingdom
3 Faculty of Medicine, University of Aberdeen, Aberdeen, United Kingdom