TY - JOUR T1 - AUTHOR'S REPLY JF - Thorax JO - Thorax SP - 916 LP - 917 DO - 10.1136/thx.50.8.916-b VL - 50 IS - 8 AU - Craig Skinner Y1 - 1995/08/01 UR - http://thorax.bmj.com/content/50/8/916.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -