title: [Birch pollen asthma in the Netherlands; an unknown phenomenon?].
mesh_terms: D001249:Asthma / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D009426:Netherlands; D011058:Pollen; D014197:Trees
vernacular_title: Berkepollenastma in Nederland; een onbekend fenomeen?