title: [Advances in epidemiologic study in Helicobacter pylori infection].
authors.forename: J Z
authors.initials: JZ
authors.lastname: Zhang
authors.forename: J J
authors.initials: JJ
authors.lastname: Chen
mesh_terms: D004269:DNA, Bacterial / Q000032:analysis; D016481:Helicobacter Infections / Q000453:epidemiology* / Q000635:transmission; D016480:Helicobacter pylori / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D016133:Polymerase Chain Reaction
chemical_list: D004269:DNA, Bacterial