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Asthma control is the goal of therapeutic interventions. In observational studies, the use of short-acting β-agonists (SABAs) is a surrogate for symptoms and emergency department or hospital events for exacerbations. To compare asthma exacerbations, medication switch, and use of SABAs among 3 treatment cohorts: fluticasone propionate and salmeterol as a single inhaler (FSC), fluticasone and salmeterol...