TY - JOUR T1 - Reply JF - Thorax JO - Thorax SP - 160 LP - 160 DO - 10.1136/thx.43.2.160 VL - 43 IS - 2 AU - DP Taggart AU - KG Davidson AU - C Gray AU - A Faichney Y1 - 1988/02/01 UR - http://thorax.bmj.com/content/43/2/160.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -