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. 2015 Oct 12;5:15013. doi: 10.1038/srep15013

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(A) Analysis with the whole studies. (B) Subgroup analysis based on the Asian and European populations. The heterogeneity test results are represented by chi2 and I². The diamond represents the summary standardized mean difference (SMD) and 95% CI. The squares and horizontal lines correspond to the study-specific SMD and 95% CI. The area of the squares reflects the corresponding weight in the meta-analyses. *mg/L.