Published on in Vol 7, No 10 (2018): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10154, first published
.
1 National Addictions Management Service, Institute of Mental Health, Singapore, Singapore
2 Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore