TY - JOUR T1 - AUTHORS' REPLY JF - Thorax JO - Thorax SP - 590 LP - 591 DO - 10.1136/thx.50.5.590-b VL - 50 IS - 5 AU - J K Chege AU - H Chrystyn Y1 - 1995/05/01 UR - http://thorax.bmj.com/content/50/5/590.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -