pH of the contents of the duodenal bulb in relation to duodenal ulcer.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004063:Digestion / Q000502:physiology; D004381:Duodenal Ulcer / Q000378:metabolism*; D004386:Duodenum / Q000000981:diagnostic imaging / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D011859:Radiography