title: Con: the increase in asthma cannot be ascribed to cleanliness.
authors.forename: T A
authors.initials: TA
authors.lastname: Platts-Mills
authors.forename: J A
authors.initials: JA
authors.lastname: Woodfolk
authors.forename: R B
authors.initials: RB
authors.lastname: Sporik
mesh_terms: D001249:Asthma / Q000453:epidemiology* / Q000209:etiology* / Q000276:immunology; D006801:Humans; D006920:Hygiene