PT - JOURNAL ARTICLE ED - Holmes, W F ED - Macfarlane, J AU - W F Holmes AU - John Macfarlane TI - Introduction AID - 10.1136/thx.54.6.538 DP - 1999 Jun 01 TA - Thorax PG - 538--539 VI - 54 IP - 6 4099 - http://thorax.bmj.com/content/54/6/538.short 4100 - http://thorax.bmj.com/content/54/6/538.full SO - Thorax1999 Jun 01; 54