TY - JOUR T1 - AUTHORS' REPLY JF - Thorax JO - Thorax SP - 1085 LP - 1086 DO - 10.1136/thx.47.12.1085-b VL - 47 IS - 12 AU - Gillian Ainslie AU - Eric Bateman Y1 - 1992/12/01 UR - http://thorax.bmj.com/content/47/12/1085.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -