title: Which is the principal early-life infection-related risk factor for asthma?
authors.forename: Matti
authors.initials: M
authors.lastname: Korppi
authors.forename: Mari
authors.initials: M
authors.lastname: Hyvärinen
authors.forename: Eija
authors.initials: E
authors.lastname: Piippo-Savolainen
mesh_terms: D001249:Asthma / Q000453:epidemiology*; D005260:Female; D005334:Fever / Q000453:epidemiology*; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000453:epidemiology*; D008297:Male; D011014:Pneumonia / Q000453:epidemiology*; D012141:Respiratory Tract Infections / Q000453:epidemiology*