RT Journal Article SR Electronic T1 JournalScan JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 815 OP 816 DO 10.1136/heart.89.7.815 VO 89 IS 7 A1 Iqbal Malik YR 2003 UL http://heart.bmj.com/content/89/7/815.abstract AB