A study of the natural history of bronchial asthma in children.
D001249:Asthma; D002648:Child; D002675:Child, Preschool; D004391:Dust; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D010919:Placebos; D011446:Prospective Studies
D004391:Dust; D010919:Placebos