TY - JOUR T1 - AUTHORS' REPLY JF - Thorax JO - Thorax SP - 150 LP - 150 DO - 10.1136/thx.46.2.150-c VL - 46 IS - 2 AU - Robert Miller AU - David Mitchell Y1 - 1991/02/01 UR - http://thorax.bmj.com/content/46/2/150.4.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -