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Flow of the study. A total of 1197 patients were investigated in the study period, and 573 patients in Group A [without proton pump inhibitors (PPI) pretreatment] and 517 in Group B (with PPI pretreatment) were included in the analysis. Patients in Group B were reclassified into three groups based on the duration of PPI pretreatment: Group B-1 (3-14 d), Group B-2 (15-55 d) and Group B-3 (≥ 56 d). H2RA: H2 receptor antagonist.
