RT Journal Article SR Electronic T1 Pulmonary artery sling. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 509 OP 509 DO 10.1136/thx.24.4.509-d VO 24 IS 4 A1 R J McCormack YR 1969 UL http://thorax.bmj.com/content/24/4/509.5.abstract AB