Effectiveness Of Inhaled Corticosteroid/Long-Acting beta 2-Agonist (ICS/LABA) Combination Therapies Among Chronic Obstructive Pulmonary Disease (COPD) Patients Stratified By Pre-Therapy Short-Acting beta 2-Agonist (SABA) Use
AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE（2011）
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