title: Controls not matched.
authors.forename: B J
authors.initials: BJ
authors.lastname: Marshall
authors.forename: G Y
authors.initials: GY
authors.lastname: Ho
mesh_terms: D016022:Case-Control Studies; D016481:Helicobacter Infections / Q000150:complications*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012107:Research Design; D013398:Sudden Infant Death / Q000209:etiology*