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Evidence rating results. The credibility of each meta-analysis result was categorized into 3 levels: ‘High (H)’, ‘Moderate (M)’, and ‘Low (L)’ by summing the scores of 5 domains: risk of bias, heterogeneity, publication bias, effect size, and imprecision. Scores in each domain ranged from 0 to 10, and a score of 50 represents the highest level of evidence. (A) dietary; (B) plasma; (C) erythrocyte.
