title: Clinical determination of airways closure, comparison of three methods in patients with lung fibrosis.
mesh_terms: D000328:Adult; D000368:Aged; D000403:Airway Resistance; D001784:Blood Gas Analysis; D005260:Female; D006371:Helium; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D010100:Oxygen; D010993:Plethysmography, Whole Body; D011658:Pulmonary Fibrosis / Q000175:diagnosis*; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests / Q000379:methods*
chemical_list: D006371:Helium; D010100:Oxygen