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. 2020 May 1;22(5):e12611. doi: 10.2196/12611

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©Dawn M Heisey-Grove, Henry J Carretta. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 01.05.2020.

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 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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Percentage of ambulatory care visits by practice size and physicians’ reported secure messaging use, 2016 (on the basis of authors’ analysis of National Center for Health Statistics and National Ambulatory Medical Care Survey, 2016). Percentages are weighted national estimates of ambulatory care visits.).