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Consensus diagnostic criteria for asthma-COPD overlap syndrome (ACOS) in patients with airflow limitation. COPD=chronic obstructive pulmonary disease; CT=computed tomography; FeNO=fractional exhaled nitric oxide; FEV1=forced expiratory volume in 1 s; FVC=forced vital capacity; LLN=lower limit of normal #Diagnosis #PCC #IM #ACOS #AsthmaCOPD #OverlapSyndrome #Asthma #COPD #Criteria #BMJ