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. 2017 May 2;12(5):e0176589. doi: 10.1371/journal.pone.0176589

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© 2017 Sun et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — (A) spontaneous NRS score; (B) evoked NRS score. Groups: R25: Perineural 0.25% ropivacaine with 15ml volume; MR: Perineural 200mg MgSO4 plus 0.25% ropivacaine with 15ml volume; R375: Perineural 0.375% ropivacaine with 15ml volume. Pain scores are presented as Mean ± SD. * P<0.01 indicates a significant difference in comparison to Group R25. # P<0.01 indicates a significant difference in comparison to Group R25 and Group MR.