TY - JOUR T1 - Correction JF - Thorax JO - Thorax SP - 844 LP - 844 DO - 10.1136/thx.2009.133108corr1 VL - 65 IS - 9 A2 - , Y1 - 2010/09/01 UR - http://thorax.bmj.com/content/65/9/844.3.abstract N2 - Millett C, Glantz SA. Assigning an ‘18’ rating to movies … ER -