TY - JOUR T1 - AUTHORS' REPLY JF - Thorax JO - Thorax SP - 873 LP - 874 DO - 10.1136/thx.51.8.873-b VL - 51 IS - 8 AU - L P Ormerod Y1 - 1996/08/01 UR - http://thorax.bmj.com/content/51/8/873.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -