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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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Forest plots for the association between COMT Val158/108Met polymorphism and PD risk-stratified by gender. (A) Addictive genetic model (A vs G). (B) Dominant genetic model (AA +GA vs GG). (C) Homozygous model (AA vs GG). (D) Heterozygous model (GA vs. GG). (E) Recessive genetic model (AA vs. GG + GA). (F) Allelic genetic model (A allele distribution frequency of COMT Val158Met gene polymorphism).