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. 2017 Jan 25;18(2):135–143. doi: 10.1007/s10195-016-0440-9

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© The Author(s) 2017

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.

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Fig. 4 — JOA score (top left panel), Neck Disability Index (top right panel), Nurick’s grade (bottom left panel), and VAS scale for axial neck pain (bottom right panel). Significant changes (p ≤ 0.05) are marked with an asterisk in the graphs