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Percentage of patients infected with Helicobacter pylori strains belonging to groups A to D after they had been subdivided on the basis of the presence (n = 34) or absence (n = 133) of intestinal metaplasia (IM). Group A (cagA−, s2, m2, babA2−), group B (cagA+, s1m1, babA2+), group C (cagA+, s1m2, babA2+), and group D (cagA+, s1m2, babA2−).
