Published on in Vol 21, No 9 (2019): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15620, first published
.
1 Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
2 South London and Maudsley NHS Foundation Trust, London, United Kingdom