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Kaplan-Meier plot for time to 50% recovery from methacholine-provoked increases in Borg dyspnoea score in patients with asthma taking one inhalation of one of the following for reliever medication: budesonide/formoterol 160/4.5 μg (via Turbuhaler®), salbutamol 100 μg (via pressurised metered-dose inhaler [pMDI]) or placebo. Reliever medication was given immediately after methacholine challenge.
