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Forest plot of the meta-analysis on the comparison of serum vitamin levels between H. pylori successful and failed eradication patients (n1: number of successful eradication patients; n2: number of failed eradication patients); The patients with successful H. pylori eradication had higher serum vitamin D levels than the failed patients (SMD = 1.37; 95% CI: 0.37 – 2.38; P < 0.001; I2 = 98.4%).
