[Upper GI tract diseases II. H. pylori-negative peptic ulcer].
Hospital Español de México. México, D.F.
Ricardo
R
Raña Garibay
D016480:Helicobacter pylori; D006801:Humans; D010437:Peptic Ulcer / Q000175:diagnosis / Q000209:etiology* / Q000382:microbiology / Q000628:therapy*