PT - JOURNAL ARTICLE AU - PJM GEORGE AU - MR Hetzel AU - FJC MILLARD TI - Reply AID - 10.1136/thx.43.3.218-a DP - 1988 Mar 01 TA - Thorax PG - 218--218 VI - 43 IP - 3 4099 - http://thorax.bmj.com/content/43/3/218.2.short 4100 - http://thorax.bmj.com/content/43/3/218.2.full SO - Thorax1988 Mar 01; 43