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. 2015 Mar 17;15:37. doi: 10.1186/s12883-015-0287-3

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© Wu et al. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Changes of the MMP-9 among different groups (OD value, $\bar{x} \pm s$ ). ^a The MMP-9 increased significantly compared to the NC group, P < 0.05; ^b Decreased significantly in the MIS group compared to the MC group, P < 0.05; ^c Decreased significantly compared to the MIS group or MC group, P < 0.05.