Lack of clinical value of biopsy of duodenal ulcer at endoscopy.
D001706:Biopsy; D004381:Duodenal Ulcer / Q000473:pathology*; D004384:Duodenoscopy; D004386:Duodenum / Q000473:pathology; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology