RT Journal Article SR Electronic T1 Correction JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 201 OP 201 DO 10.1136/thoraxjnl-2016-209333.2corr1 VO 72 IS 3 YR 2017 UL http://thorax.bmj.com/content/72/3/201.abstract AB