TY - JOUR T1 - Reply JF - Thorax JO - Thorax SP - 159 LP - 160 DO - 10.1136/thx.39.2.159-a VL - 39 IS - 2 AU - Ryan J Huxtable AU - W Mark Lafranconi Y1 - 1984/02/01 UR - http://thorax.bmj.com/content/39/2/159.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -