RT Journal Article SR Electronic T1 JournalScan JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 494 OP 496 DO 10.1136/heart.87.5.494 VO 87 IS 5 A1 Iqbal Malik YR 2002 UL http://heart.bmj.com/content/87/5/494.abstract AB