RT Journal Article SR Electronic T1 Correction JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 596 OP 596 DO 10.1136/thoraxjnl-2012-202055corr1 VO 68 IS 6 YR 2013 UL http://thorax.bmj.com/content/68/6/596.abstract AB