Persistence of Airway Inflammation and Remodeling in Subjects With Symptomatic or Complete Asthma Remission

Primary Outcome Measures : * Airway inflammation (% induced sputum eosinophils) Secondary Outcome Measures: * Perception of induced respiratory symptoms * Airway response to methacholine and AMP, and perception scores * Diurnal variation in Peak Expiratory Flows * Profile of regulatory T cells in the peripheral blood * Changes in these parameters over time (baseline, 6 months, 1 and 2 years)