Obstruction in small airways--a challenge to medicine.
D000402:Airway Obstruction / Q000175:diagnosis* / Q000209:etiology / Q000517:prevention & control; D006801:Humans; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests; D012141:Respiratory Tract Infections / Q000150:complications; D012907:Smoking; D013147:Spirometry; D014777:Virus Diseases / Q000150:complications