PT - JOURNAL ARTICLE AU - P A Corris AU - J H Dark TI - AUTHORS' REPLY AID - 10.1136/thx.45.5.424-d DP - 1990 May 01 TA - Thorax PG - 424--424 VI - 45 IP - 5 4099 - http://thorax.bmj.com/content/45/5/424.5.short 4100 - http://thorax.bmj.com/content/45/5/424.5.full SO - Thorax1990 May 01; 45