%0 Journal Article %A Maurice Campbell %A M. G. Thorne %T CONGENITAL HEART BLOCK %D 1956 %R 10.1136/hrt.18.1.90 %J British Heart Journal %P 90-102 %V 18 %N 1 %U https://heart.bmj.com/content/heartjnl/18/1/90.full.pdf