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The comparison of urease and N-nitroso compounds-producing bacteria in gastric antrum and body mucosa. The strains of the overlap of non-HP-UB and non-HP-NB between the gastric antrum and body mucosa. Kruskal-Wallis test was used to determine statistical significance existed between the four groups. HP, Helicobacter pylori; NB, nitrosating or nitrate-reducing bacteria; UB, urease-producing bacteria; con, control; *P < 0.05 compared to HP(−) control; #P < 0.05 compared to HP(−) cancer.
