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. 2021 Jul 30;23(7):e26770. doi: 10.2196/26770

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©Amrita De, Ming Huang, Tinghao Feng, Xiaomeng Yue, Lixia Yao. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 30.07.2021.

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 https://www.jmir.org/, as well as this copyright and license information must be included.

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The workflow for developing the data model for patient secure messages, annotated corpus, and topic modeling analysis. FHIR: Fast Healthcare Interoperability Resources; IAA: interannotator agreement.