title: [Clinical course and acid secretion in duodenal ulcer].
mesh_terms: D000328:Adult; D000368:Aged; D004381:Duodenal Ulcer / Q000175:diagnosis*; D004724:Endoscopy; D005260:Female; D005336:Fiber Optic Technology; D005745:Gastric Acidity Determination; D006801:Humans; D008297:Male; D008875:Middle Aged