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. 2015 Apr 17;10(4):e0124717. doi: 10.1371/journal.pone.0124717

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© 2015 Zuo 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 properly credited.

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Fig 8 — Control: Normal cartilage. W2–W20: The cartilage was subjected to the improved Hulth method and evaluated 2, 4, 8, 12, 16, and 20 weeks after surgery, respectively.