RT Journal Article SR Electronic T1 Two contrasted cases of complete heart block observed over many years. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 50 OP 54 DO 10.1136/hrt.33.1.50 VO 33 IS 1 A1 G H Jennings YR 1971 UL http://heart.bmj.com/content/33/1/50.abstract AB