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Kaplan–Meier analysis of the proportion of patients who remained free of gastric cancer after cure of H. pylori infection according to grade of background gastric mucosal atrophy at the time of eradication therapy (a) and histological type of gastric cancer (b) during the total follow-up period as long as 21 years. Asterisk: the annual risk of developing gastric cancer calculated by Kaplan–Meier analysis. Dagger: statistical significance between curves tested by log-rank test
