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. 2019 Sep 26;13:939. doi: 10.3389/fnins.2019.00939

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Copyright © 2019 Shen, Yang, Zhang and Jiang.

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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Association between blood levels of iron and Parkinson’s disease. (A) Forest plot of the Parkinson’s disease risk for blood iron level. (B) Cumulative meta-analysis of the Parkinson’s disease risk for blood iron level. The standardized mean difference (SMD) with 95% confidence interval (CI) was calculated by using the random effects model.