Risk factors of frequent exacerbations in difficult-to-treat asthma.
Butler
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C
Heaney
L G
LG
D018927:Anti-Asthmatic Agents / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy* / Q000453:epidemiology / Q000209:etiology*; D015897:Comorbidity; D003937:Diagnosis, Differential; D006801:Humans; D012008:Recurrence; D012307:Risk Factors; D017211:Treatment Failure; D016312:Treatment Refusal / Q000706:statistics & numerical data
D018927:Anti-Asthmatic Agents