RT Journal Article SR Electronic T1 HEART BLOCK AND THE SIMULATION OF BUNDLE BLOCK IN DIPHTHERIA JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 63 OP 71 DO 10.1136/hrt.7.2.63 VO 7 IS 2 A1 Harold Cookson YR 1945 UL http://heart.bmj.com/content/7/2/63.abstract AB