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. 2020 Mar 4;11:169. doi: 10.3389/fphar.2020.00169

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Copyright © 2020 Shen, Chiang and Hsiung

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 patients with rheumatoid arthritis. After excluding patients not fitting inclusion criteria, CHP and non-CHP groups comprised 4,148 patients after 1:1 matching. CHP, Chinese herbal products.