Study Treatments Patients will be randomised in a 1:1 ratio to treatment with infliximab or placebo, respectively. PRI will provide the randomisation list. At t=0 weeks, patients will either receive 5 mg/kg infliximab (Group I, n=20) or placebo (Group II, n=20). Subsequently, infliximab or placebo will be infused at weeks 2 and 6. Throughout the study period up to week 12, patients will be allowed to use inhaled corticosteroids at a stable dose regimen. Salbutamol, a short-acting beta2-agonist, will be allowed as necessary to relieve symptoms.