Seasonal variations in morbidity in cases of gastric ulcer and duodenal ulcer.
SALLSTROM
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D001699:Biometry; D004381:Duodenal Ulcer; D006801:Humans; D009017:Morbidity; D010437:Peptic Ulcer / Q000453:epidemiology* / Q000706:statistics & numerical data*; D012621:Seasons; D013276:Stomach Ulcer