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. 2019 Apr 25;15:1744806919842483. doi: 10.1177/1744806919842483

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© The Author(s) 2019

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Facial tactile thresholds during the 21 days experiment. The horizontal axis shows the day after measurement, and the vertical axis shows the facial tactile withdrawal thresholds of the rats. Mean ± standard deviation values are shown. No significant differences were shown between the LF-IS and LF-Con groups. The HF-IS group exhibited significant decreases in periorbital tactile thresholds compared with the HF-Con group (*P < 0.05, ***P < 0.001) from day 3 of the study. HF: high frequency; LF: low frequency; IS: inflammatory soup; Con: control.