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. 2018 Mar 9;18:25. doi: 10.1186/s12883-018-1027-2

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© The Author(s). 2018

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — The box chart of the VRSd-system from three parameters of three tests. The variance of S1 and S3 test are much smaller than S2, indicating that S2 has the much larger individual difference of group