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. 2020 Jun 29;6(2):e17073. doi: 10.2196/17073

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©Joshua C Black, Zachary R Margolin, Richard A Olson, Richard C Dart. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 29.06.2020.

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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Flowchart of data cleaning process for data collected from the 1st quarter of 2015 through to the 4th quarter of 2018 where percentages represent the proportion of exclusions at each step.