TY - JOUR T1 - Essentials of Respiratory Disease JF - Thorax JO - Thorax SP - 275 LP - 276 DO - 10.1136/thx.46.4.275-b VL - 46 IS - 4 AU - PB Y1 - 1991/04/01 UR - http://thorax.bmj.com/content/46/4/275.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -