title: Gastroduodenal ulcer; its frequency and location.
authors.forename: H
authors.initials: H
authors.lastname: FERNANDEZ
mesh_terms: D001699:Biometry; D010437:Peptic Ulcer / Q000453:epidemiology* / Q000706:statistics & numerical data*
vernacular_title: Ulcera gastroduodenal; su frecuencia y localización.