RT Journal Article SR Electronic T1 Pathological assessment of mediastinal lymph nodes in lung cancer: implications for non-invasive mediastinal staging. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 584 OP 584 DO 10.1136/thx.48.5.584 VO 48 IS 5 A1 S H Ren A1 S J Xu YR 1993 UL http://thorax.bmj.com/content/48/5/584.1.abstract AB