The point of onset of 'airway closure' measured with argon and nitrogen: a comparison of results obtained by two methods.
D000328:Adult; D001128:Argon; D001980:Bronchi / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D008722:Methods; D008875:Middle Aged; D009584:Nitrogen; D012123:Pulmonary Ventilation; D012143:Respiratory Physiological Phenomena
D001128:Argon; D009584:Nitrogen