TY - JOUR T1 - Commentary: yet more to see down the bronchial tree? JF - Thorax JO - Thorax SP - 226 LP - 227 DO - 10.1136/thx.51.2.226 VL - 51 IS - 2 AU - M. R. Hetzel Y1 - 1996/02/01 UR - http://thorax.bmj.com/content/51/2/226.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -