RT Journal Article SR Electronic T1 Risk assessment in coronary artery surgery JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1 OP 2 DO 10.1136/heart.89.1.1 VO 89 IS 1 A1 Pepper, J R YR 2003 UL http://heart.bmj.com/content/89/1/1.abstract AB