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A schematic diagram of the study. PU: Peptic ulcer; GU: Gastric ulcer; DU: Duodenal ulcer; GC: Gastric cancer; Hp: Helicobacter pylori; HpGU-GC: GCs with previous GU and H. pylori infection; HpDU-GC: GCs with previous DU and H. pylori infection; HpGUDU-GC: GCs with previous both GU and DU and H. pylori infection.
