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. 2018 Jan 19;46(4):1477–1485. doi: 10.1177/0300060517748843

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© The Author(s) 2018

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Correlation analysis of serum brain-derived neurotrophic factor (BDNF) concentration according to age, age at onset, disease duration, UPDRS score, Hoehn and Yahr stage, and treatment with L-DOPA. UPDRS = Unified Parkinson’s Disease Rating Scale.