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The authors have advised that there is an error in Figure 4 on page 1423. Figure 4E, showing representative images of DAPI staining of human gingival fibroblasts grown at three different titanium surfaces at different culture days, contained an accidental image duplication. This correction does not alter or affect the statistical measurements made in the figure or any conclusions of the original article. The correct Figure 4E is shown below.
The authors apologize for this error.