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. 2018 Jan 29;8:1804. doi: 10.1038/s41598-018-20129-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Distribution of variables with directionality in PD-PS patients. Color bars represent the frequencies of PD-PS patients for each variable with directionality, including laterality of motor symptoms, subjective visual vertical (SVV), EMG hyperactivity, or canal paresis, respectively. Red color illustrates the frequency of PD-PS patients tilting to the less affected side, with ipsiversive SVV, ipsilateral EMG hyperactivity, or ipsilateral canal paresis. Blue color depicts the frequency of PD-PS patients tilting to the more affected side, with contraversive SVV, contralateral EMG hyperactivity, or contralateral canal paresis. Gray color represents the frequency of PD-PS patients who exhibit normal SVV, bilateral EMG hyperactivity, or no canal paresis.