PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1136/thoraxjnl-2012-202055corr1 DP - 2013 Jun 01 TA - Thorax PG - 596--596 VI - 68 IP - 6 4099 - http://thorax.bmj.com/content/68/6/596.short 4100 - http://thorax.bmj.com/content/68/6/596.full SO - Thorax2013 Jun 01; 68