RT Journal Article SR Electronic T1 Correction JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 162 OP 162 DO 10.1136/thoraxjnl-2012-202678.355corr1 VO 68 IS 2 YR 2013 UL http://thorax.bmj.com/content/68/2/162.6.abstract AB