PT - JOURNAL ARTICLE ED - , TI - Bloody filter AID - 10.1136/tc.7.2.e116 DP - 1998 Jun 01 TA - Tobacco Control PG - 116--116 VI - 7 IP - 2 4099 - http://tobaccocontrol.bmj.com/content/7/2/116.6.short 4100 - http://tobaccocontrol.bmj.com/content/7/2/116.6.full SO - Tob Control1998 Jun 01; 7