Assertion: amoxicillin | /r/HasProperty | either metronidazole
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Source sentences:
text: Concomitant regimen: Amoxicillin 1 g twice daily in combination with clarithromycin 500 mg twice daily, either metronidazole or tinidazole 500 mg twice daily, plus a standard-dose proton pump inhibitor twice daily; continue regimen for 10 to 14 days (ACG [Chey 2017]).