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. 2018 Jan 24;60(3):247–254. doi: 10.1007/s00234-017-1971-3

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Correlation between 2-year change in fractional anisotropy (FA) in the putamen with the daily l-dopa equivalent dose (LEDD) at baseline. A moderate positive correlation was found between 2-year change in FA in the putamen and LEDD at baseline in PD. R2 linear, linear correlation coefficient; Rs, Spearman’s rho