RT Journal Article SR Electronic T1 Dyspnoea perception and susceptibility to exacerbation in COPD JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 107 OP 108 DO 10.1136/thoraxjnl-2016-209318 VO 72 IS 2 A1 Heidi A Ridsdale A1 John R Hurst YR 2017 UL http://thorax.bmj.com/content/72/2/107.abstract AB