Peptic ulcer disease in childhood reexamined.
D000208:Acute Disease; D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010414:Pennsylvania; D010437:Peptic Ulcer / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D012189:Retrospective Studies