Published on in Vol 22, No 11 (2020): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16632, first published
.
![Usability and Acceptability of a Mobile App to Help Emerging Adults Address their Friends' Substance Use (Harbor): Quantitative Study Usability and Acceptability of a Mobile App to Help Emerging Adults Address their Friends' Substance Use (Harbor): Quantitative Study](https://asset.jmir.pub/assets/7608ce4b0a1caa1afd57a6a901f94a28.png 480w,https://asset.jmir.pub/assets/7608ce4b0a1caa1afd57a6a901f94a28.png 960w,https://asset.jmir.pub/assets/7608ce4b0a1caa1afd57a6a901f94a28.png 1920w,https://asset.jmir.pub/assets/7608ce4b0a1caa1afd57a6a901f94a28.png 2500w)
1 University of Illinois Urbana-Champaign, Urbana, IL, United States
2 Texas State University, San Marcos, TX, United States