RT Journal Article SR Electronic T1 JOHN COWAN JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP i8 OP 3 DO 10.1136/hrt.10.1.i8 VO 10 IS 1 A1 W. E. Hume YR 1948 UL http://heart.bmj.com/content/10/1/i8.abstract AB