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Comparison of gastric inflammation scores in Hp− and Hp+ patients. a The comparison between Hp+ and Hp− group, and b the comparison of Hp+ patients categorized by CagA and VacA expressions. The error bar shows SEM. Different letters above the columns indicate that the means are different, where a > b (P < 0.05). The columns that share a letter are not different, i.e., ab is not different from either a or b
