TY - JOUR T1 - Correction JF - Thorax JO - Thorax SP - 752 LP - 752 DO - 10.1136/thorax.57.8.752-b VL - 57 IS - 8 A2 - , Y1 - 2002/08/01 UR - http://thorax.bmj.com/content/57/8/752.3.abstract N2 - In the paper entitled “Effects of daily variation in outdoor particulates and ambient acid … ER -