PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1136/tc.2011.040170corr1 DP - 2011 Nov 01 TA - Tobacco Control PG - 418--418 VI - 20 IP - 6 4099 - http://tobaccocontrol.bmj.com/content/20/6/418.short 4100 - http://tobaccocontrol.bmj.com/content/20/6/418.full SO - Tob Control2011 Nov 01; 20