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Alpha-diversity of oral microorganisms in each sampling methods among four groups. Overall comparison of Alpha-diversity of species among the four groups(a), Boxplots show the ACE diversity index (b), the simpson diversity index (c), the chao1 diversity index (d) and shannon diversity index (e) of each sampling methods among four groups. (Tukey and Wilcox test, ⁎p < 0.05,⁎⁎p < 0.01,⁎⁎⁎p < 0.005).
