RT Journal Article SR Electronic T1 The cost of helical CT lung cancer screening is high JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 298 OP 298 DO 10.1136/thorax.58.4.298 VO 58 IS 4 A1 M Wood YR 2003 UL http://thorax.bmj.com/content/58/4/298.abstract AB