Published on in Vol 8, No 3 (2020): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16251, first published
.
![Pilot Study of a Multilevel Mobile Health App for Substance Use, Sexual Risk Behaviors, and Testing for Sexually Transmitted Infections and HIV Among Youth: Randomized Controlled Trial Pilot Study of a Multilevel Mobile Health App for Substance Use, Sexual Risk Behaviors, and Testing for Sexually Transmitted Infections and HIV Among Youth: Randomized Controlled Trial](https://asset.jmir.pub/assets/09332b5a940e8bb4a5a0ff2c4d80c2fd.png 480w,https://asset.jmir.pub/assets/09332b5a940e8bb4a5a0ff2c4d80c2fd.png 960w,https://asset.jmir.pub/assets/09332b5a940e8bb4a5a0ff2c4d80c2fd.png 1920w,https://asset.jmir.pub/assets/09332b5a940e8bb4a5a0ff2c4d80c2fd.png 2500w)
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