Histological analysis of upper gastrointestinal endoscopic biopsies.
D001706:Biopsy; D004378:Duodenal Diseases / Q000473:pathology*; D004724:Endoscopy; D004935:Esophageal Diseases / Q000473:pathology*; D006801:Humans; D013272:Stomach Diseases / Q000473:pathology*