PT - JOURNAL ARTICLE ED - , TI - Notice of duplicate publication AID - 10.1136/thorax.57.1.6 DP - 2002 Jan 01 TA - Thorax PG - 6--6 VI - 57 IP - 1 4099 - http://thorax.bmj.com/content/57/1/6.short 4100 - http://thorax.bmj.com/content/57/1/6.full SO - Thorax2002 Jan 01; 57