RT Journal Article SR Electronic T1 Extrathoracic hyperinflation JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP thoraxjnl-2017-210804 DO 10.1136/thoraxjnl-2017-210804 A1 Marie Bruyneel A1 Vincent Ninane YR 2017 UL http://thorax.bmj.com/content/early/2017/09/02/thoraxjnl-2017-210804.abstract AB