PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1136/thoraxjnl-2012-202678.232corr1 DP - 2013 Feb 01 TA - Thorax PG - 162--162 VI - 68 IP - 2 4099 - http://thorax.bmj.com/content/68/2/162.3.short 4100 - http://thorax.bmj.com/content/68/2/162.3.full SO - Thorax2013 Feb 01; 68