RT Journal Article SR Electronic T1 PROCEEDINGS OF THE CARDIAC SOCIETY OF GREAT BRITAIN AND IRELAND JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 233 OP 238 DO 10.1136/hrt.8.4.233 VO 8 IS 4 YR 1946 UL http://heart.bmj.com/content/8/4/233.abstract AB