Published on in Vol 21, No 9 (2019): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/14567, first published
.
![Objective User Engagement With Mental Health Apps: Systematic Search and Panel-Based Usage Analysis Objective User Engagement With Mental Health Apps: Systematic Search and Panel-Based Usage Analysis](https://asset.jmir.pub/assets/b13cd511f20046241660608e78a826ea.png 480w,https://asset.jmir.pub/assets/b13cd511f20046241660608e78a826ea.png 960w,https://asset.jmir.pub/assets/b13cd511f20046241660608e78a826ea.png 1920w,https://asset.jmir.pub/assets/b13cd511f20046241660608e78a826ea.png 2500w)
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