Research Article Br Dent J 2012; 213: E16
Three tables were missing from the original article. The missing tables are provided below.
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The online version of the original article can be found at https://doi.org/10.1038/sj.bdj.2012.989
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Correction. Br Dent J 224, 626 (2018). https://doi.org/10.1038/sj.bdj.2018.334
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DOI: https://doi.org/10.1038/sj.bdj.2018.334