A comparison of the inflammatory control of asthma provided by one inhalation of Symbicort® Turbohaler® 160/4.5 µg/inhalation b.i.d. plus as-needed versus one inhalation Symbicort® Turbuhaler® 320/9 µg/inhalation b.i.d. plus one inhalation of Pulmicort® Turbuhaler® 400 µg/dos b.i.d. plus Terbutaline Turbuhaler® as-needed. A 12-month, randomised, double-blind, parallel-group, active controlled, multinational, phase IIIB study in adult patients with asthma, EOS