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. 2023 Mar 16;15:1109914. doi: 10.3389/fnagi.2023.1109914

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Copyright © 2023 Zhong and Wang.

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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Forest plot for comparison in change of motor function between PD-DM and PD-noDM. CI, confidence interval; DM, diabetes mellitus; PD, Parkinson's disease; PD-DM, PD with DM; PD-noDM, PD without DM; SMD, standard mean difference.