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. 2020 Apr 21;6(2):e18700. doi: 10.2196/18700

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©Jiawei Ken Li, Qing Xu, Raphael Cuomo, Vidya Purushothaman, Tim Mackey. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 21.04.2020.

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 JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on http://publichealth.jmir.org, as well as this copyright and license information must be included.

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