Step 3 of the asthma guidelines.
Tattersfield
A E
AE
Harrison
T W
TW
D018927:Anti-Asthmatic Agents / Q000627:therapeutic use; D001249:Asthma / Q000188:drug therapy*; D006801:Humans; D017410:Practice Guidelines as Topic; D016032:Randomized Controlled Trials as Topic; D016896:Treatment Outcome; D006113:United Kingdom
D018927:Anti-Asthmatic Agents