TY - JOUR T1 - Reply JF - Thorax JO - Thorax SP - 159 LP - 159 DO - 10.1136/thx.43.2.159-a VL - 43 IS - 2 AU - David Mitchell AU - Susan EJ Tolfree AU - MD Short AU - MA Solomon AU - Stephen Spiro Y1 - 1988/02/01 UR - http://thorax.bmj.com/content/43/2/159.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -