RT Journal Article SR Electronic T1 CHARLES HERAPATH JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 80 OP 80 DO 10.1136/hrt.9.2.80 VO 9 IS 2 A1 C. Bruce Perry YR 1947 UL http://heart.bmj.com/content/9/2/80.abstract AB