title: The changing prevalence of asthma?
mesh_terms: D000293:Adolescent; D000328:Adult; D000917:Antibody Formation; D001249:Asthma / Q000453:epidemiology* / Q000276:immunology; D002648:Child; D019049:Developed Countries; D004485:Eczema / Q000453:epidemiology / Q000276:immunology; D006801:Humans; D008875:Middle Aged; D015995:Prevalence; D006255:Rhinitis, Allergic, Seasonal / Q000453:epidemiology / Q000276:immunology