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. 2017 Jun 26;18(1):64. doi: 10.1186/s10194-017-0774-6

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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. 2 — Mean numeric rating scale (NRS) scores of both groups. The difference in NRS scores between mTIH groups and non-mTIH group was statistically significant (95% confidence interval, 0.11 to 1.14; p < 0.05, ANCOVA)