RT Journal Article SR Electronic T1 The Present Position Relating to Cancer of the Lung JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1 OP 21 DO 10.1136/thx.15.1.1 VO 15 IS 1 A1 Mason, George A. YR 1960 UL http://thorax.bmj.com/content/15/1/1.abstract AB