title: "Small airways disease" in children: no test is best.
mesh_terms: D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000175:diagnosis* / Q000503:physiopathology; D002648:Child; D003550:Cystic Fibrosis / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D006371:Helium; D006801:Humans; D008168:Lung / Q000502:physiology; D008297:Male; D009584:Nitrogen; D012129:Respiratory Function Tests
chemical_list: D006371:Helium; D009584:Nitrogen