Reflux esophagitis in duodenal ulcer patients.
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D004381:Duodenal Ulcer / Q000150:complications* / Q000382:microbiology; D005764:Gastroesophageal Reflux / Q000209:etiology*; D016481:Helicobacter Infections / Q000150:complications*; D016480:Helicobacter pylori; D006801:Humans; D013997:Time Factors