PT - JOURNAL ARTICLE AU - L P Ormerod TI - AUTHORS' REPLY AID - 10.1136/thx.51.8.873-b DP - 1996 Aug 01 TA - Thorax PG - 873--874 VI - 51 IP - 8 4099 - http://thorax.bmj.com/content/51/8/873.3.short 4100 - http://thorax.bmj.com/content/51/8/873.3.full SO - Thorax1996 Aug 01; 51