. 2019 Jun 8;21(6):e13253. doi: 10.2196/13253
©Christopher A Sanders, Stephen M Schueller, Acacia C Parks, Ryan T Howell. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 08.06.2019.
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Figure 2.
Survival curves demonstrating the portion of participants retained over time.