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. 2020 Mar 10;14:157. doi: 10.3389/fnins.2020.00157

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Copyright © 2020 Song, Li, Li, Chen, Wei, Liu and Cheng.

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 displaying random-effects meta-analysis results for the association between Alzheimer's disease (AD) (A) and Parkinson's disease (PD) (B) and estrogen replacement therapy (ERT).