Published on in Vol 20, No 6 (2018): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10148, first published
.
1 Koko, New York, NY, United States
2 Department of Computer Science, Columbia University, New York, NY, United States
3 Center for Behavioral Intervention Technologies, Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States