TY - JOUR T1 - Commentary JF - Thorax JO - Thorax SP - 1323 LP - 1323 DO - 10.1136/thx.50.12.1323 VL - 50 IS - 12 AU - D M Geddes Y1 - 1995/12/01 UR - http://thorax.bmj.com/content/50/12/1323.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -