Compare efficacy and safety of 10-day triple therapy (rabeprazole, clarithromycin and amoxicillin) plus N-acetylcystein versus 10-day concomitant therapy (rabeprazole, clarithromycin, amoxicillin and metronidazole) for re-eradication for gastric Helicobacter pylori infection.
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Re-eradication rate
Timeframe: 4 weeks after complete use of drug for treatment