Original Research

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

Johns DP, Das A, Toelle BG, Abramson MJ, Marks GB, Wood-Baker R, Walters EH

International Journal of Chronic Obstructive Pulmonary Disease 2017, 12:3567-3577

Published Date: 13 December 2017