title: Development of lower respiratory symptoms.
authors.affiliation: Voksentoppen Center of Asthma, Allergy and Chronic Lung Diseases in Children, Oslo, Norway.
authors.forename: K H
authors.initials: KH
authors.lastname: Carlsen
mesh_terms: D016535:Bronchial Hyperreactivity; D002648:Child; D002908:Chronic Disease; D004781:Environmental Exposure / Q000009:adverse effects; D006801:Humans; D012008:Recurrence; D012130:Respiratory Hypersensitivity / Q000276:immunology; D012140:Respiratory Tract Diseases / Q000209:etiology* / Q000276:immunology; D012307:Risk Factors; D014777:Virus Diseases / Q000150:complications