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. 2019 Sep 25;21(9):e14567. doi: 10.2196/14567

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©Amit Baumel, Frederick Muench, Stav Edan, John M Kane. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 25.09.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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App 30-day retention by primary incorporated technique. The percentages reflect the number of users who opened the app from day 1 to day 30 out of the number of users who installed and opened the app on day 0.