title: Regional differences in prevalence and risks of respiratory diseases in children.
authors: Pediatric Pulmonology and Allergy Division, University of California, San Francisco 94143-0130, USA.
authors: G J
authors: GJ
authors: Cropp
mesh_terms: D001249:Asthma / Q000209:etiology; D002648:Child; D006801:Humans; D015995:Prevalence; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000209:etiology*; D012307:Risk Factors