RT Journal Article SR Electronic T1 Thoracic Surgical Techniques JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 76 OP 76 DO 10.1136/thx.46.1.76-a VO 46 IS 1 A1 JHD YR 1991 UL http://thorax.bmj.com/content/46/1/76.2.abstract AB