RT Journal Article SR Electronic T1 JAMES WILLIAM BROWN JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 284 OP 288 DO 10.1136/hrt.21.2.284 VO 21 IS 2 A1 D. Evan Bedford A1 D. C. Muir YR 1959 UL http://heart.bmj.com/content/21/2/284.abstract AB