Published on in Vol 21, No 8 (2019): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12914, first published
.

1 Behavioural Science Institute, Radboud University , Nijmegen , NL
2 Social AI Group, Vrije Universiteit , Amsterdam , NL
3 Radboud Institute for Health Sciences, Radboud University and Medical Centre , Nijmegen , NL
*these authors contributed equally