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. 2018 Sep 11;9:754. doi: 10.3389/fneur.2018.00754

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Copyright © 2018 Ma, Meng, Tan, Liu, Zhao, Yu, Jin, Zhao and Liu.

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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Flow chart of study implementation. PD, Parkinson's disease; MMSE, Mini-Mental State Examination; PDQ-39, Parkinson's Disease Questionnaire−39 Items; QoL, quality of life; UPDRS, Unified Parkinson's Disease Rating Scale; NEO-FFI, Extraversion Openness Five-Factor Inventory.