PT - JOURNAL ARTICLE AU - JMB Hughes TI - Commentary AID - 10.1136/thx.50.1.100 DP - 1995 Jan 01 TA - Thorax PG - 100--100 VI - 50 IP - 1 4099 - http://thorax.bmj.com/content/50/1/100.short 4100 - http://thorax.bmj.com/content/50/1/100.full SO - Thorax1995 Jan 01; 50