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. 2019 Jul 12;10:644. doi: 10.3389/fgene.2019.00644

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Copyright © 2019 Tang, Wang, Shi, Zhang, Zhou, Li, Ma, Chen, Xiang and Gao

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 differences between Val carriers and Met homozygotes on the cognitive effects. (A) UPDRS III. (B) MMSE. (C) IQ Score. UPDRS, Unified Parkinson’s Disease Rating Scale; MMSE, Mini Mental State Examination; CI, confidence interval; OR, odds ratio. a, Val/Val vs Met/Met; b, Val/Met vs Met/Met.