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The preoperative serum level of Hp was validated by ELISA. One-way ANOVA analysis showed significant difference of preoperative serum Hp expressions among the three groups. The preoperative serum levels of Hp in thirteen nonresponders was significantly lower than that of thirty-seven responders (p <0.001) and twenty-one healthy controls (p <0.001). No significant difference was seen between the responders and healthy controls (p > 0.05).
