Asthma in every fifth child in Oslo, Norway: a 10‐year follow up of a birth cohort study *

Background:  The western world's increase in childhood asthma is suggested to level off. We aimed to investigate asthma prevalence in 10‐year‐old children within the prospective birth cohort Environment and Childhood Asthma (ECA) Study in Oslo established in 1992/1993.

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