RT Journal Article SR Electronic T1 Left main coronary artery lesion detected by transoesophageal echocardiography before cardioversion JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 667 OP 667 DO 10.1136/hrt.82.6.667 VO 82 IS 6 A1 O DOVEN A1 B BERKALP A1 D ORAL YR 1999 UL http://heart.bmj.com/content/82/6/667.abstract AB