TY - JOUR T1 - The biphasic spirogram: a clue to unilateral narrowing of a mainstem bronchus. JF - Thorax JO - Thorax SP - 151 LP - 151 DO - 10.1136/thx.46.2.151-b VL - 46 IS - 2 A2 - , Y1 - 1991/02/01 UR - http://thorax.bmj.com/content/46/2/151.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -