TY - JOUR T1 - Thorax: Annual Report October 1992-September 1993 JF - Thorax JO - Thorax SP - 1290 LP - 1291 DO - 10.1136/thx.48.12.1290 VL - 48 IS - 12 A2 - , Y1 - 1993/12/01 UR - http://thorax.bmj.com/content/48/12/1290.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -