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We have explored whether assessing the degree of concavity in the descending limb of the maximum expiratory flow-volume curve enhanced spirometric detection of early small airway disease.

Improved spirometric detection of small airway narrowing: concavity in the expiratory flow&ndash;volume curve in people aged over 40 years

Improved spirometric detection of small airway narrowing: concavity in the expiratory flow–volume curve in people aged over 40 years