RT Journal Article SR Electronic T1 COR BILOCULARE JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 126 OP 128 DO 10.1136/hrt.24.1.126 VO 24 IS 1 A1 A. W. McCracken YR 1962 UL http://heart.bmj.com/content/24/1/126.abstract AB