TY - JOUR T1 - AUTHORS' REPLY JF - Thorax JO - Thorax SP - 484 LP - 484 DO - 10.1136/thx.47.6.484-a VL - 47 IS - 6 AU - Charlotte Suppli Ulrik AU - Vibeke Backer AU - Asger Dirksen Y1 - 1992/06/01 UR - http://thorax.bmj.com/content/47/6/484.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -