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Effect of treatment with placebo, ranitidine, omeprazole 10 mg (OM10), or omeprazole 20 mg (OM20) on individual dyspeptic symptoms. The horizontal bars show the percentages of patients with each individual symptom before and after each two week double blind treatment. *p<0.05; **p<0.025, ***p<0.001 compared with placebo in the same Helicobacter pylori (HP) group.
