Assessment of the value of gastroscopy in the diagnosis of gastric ulcer.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003951:Diagnostic Errors; D005260:Female; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013276:Stomach Ulcer / Q000175:diagnosis* / Q000000981:diagnostic imaging