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Funnel plots of the meta-analysis on relationships between H. pylori and vitamins: (A) Comparison of serum vitamin levels between H. pylori - positive and H. pylori - negative patients; (B) Comparison of serum vitamin levels between H. pylori successful and failed eradication patients; (C) Comparison of serum vitamin levels before and after successful H. pylori eradication therapy; (D) Effect of vitamin supplements on the H. pylori eradication rate.
