title: Closing volume in 50- and 60- year old men: (a preliminary report).
mesh_terms: D000367:Age Factors; D000403:Airway Resistance; D006801:Humans; D008168:Lung / Q000502:physiology* / Q000503:physiopathology; D008176:Lung Volume Measurements / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000503:physiopathology; D012907:Smoking / Q000503:physiopathology