RT Journal Article SR Electronic T1 Authors' response to assessment of intraparenchymal lung collateral ventilation JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1111 OP 1111 DO 10.1136/thoraxjnl-2012-202455 VO 67 IS 12 A1 Helen Marshall A1 Rod Lawson A1 Jim M Wild YR 2012 UL http://thorax.bmj.com/content/67/12/1111.2.abstract AB