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. 2016 Jun 1;18(6):e127. doi: 10.2196/jmir.5644

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©Jessie L Juusola, Thomas R Quisel, Luca Foschini, Joseph A Ladapo. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 01.06.2016.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), 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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Participant recruitment and enrollment flowchart. aEligibility criteria: (1) claims were collected from all insurance carriers under which the respondent had coverage during the relevant time period, and (2) claims were collected from at least 67% of the healthcare providers entered in the study survey.