RT Journal Article SR Electronic T1 Congenital heart block and hypothyroidism. JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 256 OP 258 DO 10.1136/adc.53.3.256 VO 53 IS 3 A1 A A Syed YR 1978 UL http://adc.bmj.com/content/53/3/256.abstract AB