Duodenal ulcer in childhood. A study of predisposing factors.
D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D000747:Anemia, Hypochromic / Q000209:etiology; D001789:Blood Group Antigens; D001835:Body Weight; D002648:Child; D004381:Duodenal Ulcer / Q000209:etiology*; D005260:Female; D005500:Follow-Up Studies; D005745:Gastric Acidity Determination; D005750:Gastric Juice / Q000378:metabolism*; D006396:Hematemesis / Q000209:etiology; D006801:Humans; D008297:Male; D012737:Sex Factors; D014839:Vomiting / Q000209:etiology
D000017:ABO Blood-Group System; D001789:Blood Group Antigens