Acidity at different sites in the proximal duodenum of normal subjects and patients with duodenal ulcer.
D000328:Adult; D004063:Digestion / Q000502:physiology; D004381:Duodenal Ulcer / Q000378:metabolism*; D004386:Duodenum / Q000000981:diagnostic imaging / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D011859:Radiography