TY - JOUR T1 - AUTHOR'S REPLY JF - Thorax JO - Thorax SP - 78 LP - 78 DO - 10.1136/thx.45.1.78-a VL - 45 IS - 1 AU - SP O'Hickey Y1 - 1990/01/01 UR - http://thorax.bmj.com/content/45/1/78.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -