RT Journal Article SR Electronic T1 LIGATURE OF PATENT DUCTUS ARTERIOSUS JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 91 OP 94 DO 10.1136/hrt.7.2.91 VO 7 IS 2 A1 Geoffrey Bourne YR 1945 UL http://heart.bmj.com/content/7/2/91.abstract AB