title: Difficult asthma.
authors.affiliation: National Heart and Lung Institute, London.
authors.forename: P J
authors.initials: PJ
authors.lastname: Barnes
authors.forename: K F
authors.initials: KF
authors.lastname: Chung
mesh_terms: D001249:Asthma / Q000188:drug therapy* / Q000209:etiology; D006801:Humans; D010349:Patient Compliance; D013256:Steroids / Q000627:therapeutic use
chemical_list: D013256:Steroids