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. 2022 Oct 18;9:1008683. doi: 10.3389/fmed.2022.1008683

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Copyright © 2022 Zhou, Yang, He, Lv, Wang, Deng and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Subclass distribution of TCM trials registered from 2013 to 2021 in mainland China. (A) Respiratory system; (B) Alimentary tract and metabolism; (C) Genitourinary system and reproductive hormones; (D) Cardiovascular system.