RT Journal Article SR Electronic T1 Some reflections on how not to get bitten by a clinical guideline JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 501 OP 502 DO 10.1136/heart.87.6.501 VO 87 IS 6 A1 D Hart YR 2002 UL http://heart.bmj.com/content/87/6/501.abstract AB