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. 2020 Jun 15;8(6):e18186. doi: 10.2196/18186

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©Weijia Chen, Zhijun Lu, Lijue You, Lingling Zhou, Jie Xu, Ken Chen. Originally published in JMIR Medical Informatics (http://medinform.jmir.org), 15.06.2020.

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 Medical Informatics, is properly cited. The complete bibliographic information, a link to the original publication on http://medinform.jmir.org/, as well as this copyright and license information must be included.

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Flowchart of the selection process for patient records. Gray boxes show records that were excluded due to patients not meeting inclusion criteria and records containing outliers or missing data. SSI: surgical site infection.