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. 2018 Apr 10;20:70. doi: 10.1186/s13075-018-1563-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Study design and numbers of patients in each group who completed or withdrew from the 24-week TRIFRA study and 2-year follow up. RA, rheumatoid arthritis; MTX, methotrexate; TwHF, Tripterygium wilfordii Hook F