Letter: Endoscopic liver biopsy.
D001706:Biopsy; D004381:Duodenal Ulcer / Q000150:complications / Q000175:diagnosis; D004724:Endoscopy; D006801:Humans; D008099:Liver / Q000473:pathology*; D008107:Liver Diseases / Q000209:etiology / Q000473:pathology; D008297:Male; D010439:Peptic Ulcer Perforation / Q000150:complications