Published on in Vol 7, No 2 (2019): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12209, first published
.
1 Department of Psychology and Neuroscience, Duke University, Durham, NC, United States
2 Duke Digital Health Science Center, Duke Global Health Institute, Durham, NC, United States
3 Stanford Prevention Research Center, Stanford University School of Medicine, Palo Alto, CA, United States