RT Journal Article SR Electronic T1 Prophylactic antibiotic treatment to prevent infective endocarditis: new guidance from the National Institute for Health and Clinical Excellence JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 774 OP 780 DO 10.1136/hrt.2008.147702 VO 95 IS 9 A1 Nicholas Brooks YR 2009 UL http://heart.bmj.com/content/95/9/774.abstract AB