RT Journal Article SR Electronic T1 PROCEEDINGS OF THE BRITISH CARDIAC SOCIETY JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 541 OP 546 DO 10.1136/hrt.14.4.541 VO 14 IS 4 YR 1952 UL http://heart.bmj.com/content/14/4/541.abstract AB