title: Factors contributing to airflow obstruction in patients with chronic bronchitis and emphysema.
mesh_terms: D000402:Airway Obstruction; D001991:Bronchitis / Q000503:physiopathology*; D002908:Chronic Disease; D006801:Humans; D011656:Pulmonary Emphysema / Q000503:physiopathology*; D012123:Pulmonary Ventilation; D012119:Respiration; D013147:Spirometry