Are small airways tests helpful in the detection of early airflow obstruction?
D000402:Airway Obstruction / Q000175:diagnosis*; D002908:Chronic Disease; D003011:Closing Volume; D005541:Forced Expiratory Volume; D006801:Humans; D012115:Residual Volume; D012129:Respiratory Function Tests; D012907:Smoking; D013147:Spirometry