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. 2023 Aug 2;10:1200592. doi: 10.3389/fmed.2023.1200592

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Copyright © 2023 Wang, Wang, Xiang, Jin, Zhang, Zeng, Tong and Lv.

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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The forest plot for studies on the effect of vitamin D on the change of WOMAC stiffness. WOMAC, Western Ontario and McMaster Universities Arthritis Index.