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. 2014 Apr 16;9(4):e94937. doi: 10.1371/journal.pone.0094937

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© 2014 Dong 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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Each bar represents the mean ± standard deviation of 3 independent experiments performed in triplicate. *, p<0.05 compared to the former testing time in the same group; ^#, no significant differences were found when compared with the PDLLA/nHA group by one-way ANOVA (p>0.05).