Dynamic expiratory tracheal collapse in COPD: correlation with clinical and physiologic parameters.
Boiselle PM, Michaud G, Roberts DH, Loring SH, Womble HM, Millett ME, O'Donnell CR. Dynamic expiratory tracheal collapse in COPD: correlation with clinical and physiologic parameters. Chest. 2012 Dec; 142(6):1539-1544.