RT Journal Article SR Electronic T1 Stress myocardial contrast echocardiography JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1391 OP 1393 DO 10.1136/heart.89.12.1391 VO 89 IS 12 A1 Monaghan, M J YR 2003 UL http://heart.bmj.com/content/89/12/1391.abstract AB