Published on in Vol 6 , No 8 (2022) :August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/34422, first published
.

1 Behavioural Science and Insights Unit, UK Health Security Agency, Liverpool, GB
2 Behavioural Science and Insights Unit, UK Health Security Agency, Bristol, GB
3 Behavioural Science and Insights Unit, UK Health Security Agency, Salisbury, GB