[Chronic peptic ulcer in patients over 50].
D000367:Age Factors; D000368:Aged; D001294:Attitude to Health; D004381:Duodenal Ulcer / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D010437:Peptic Ulcer / Q000453:epidemiology*; D012008:Recurrence; D013276:Stomach Ulcer / Q000453:epidemiology
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