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. 2021 Jan 25;11:597703. doi: 10.3389/fphar.2020.597703

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Copyright © 2021 Huang, Liu, Hsu, Yang, Lee, Huang and Wu.

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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Flowchart of recruitment from the Chang Gung Research Database. CGMH, Chang Gung Memorial Hospital; HbA1c, glycated hemoglobin; OHA, oral hypoglycemia agents; RCEG, Rhizoma Coptidis extract granules; TCM, traditional Chinese medicine.