RT Journal Article SR Electronic T1 COMPLETE HEART BLOCK JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 69 OP 92 DO 10.1136/hrt.6.2.69 VO 6 IS 2 A1 Campbell, Maurice YR 1944 UL http://heart.bmj.com/content/6/2/69.abstract AB