RT Journal Article SR Electronic T1 Cardiac pacing in infants and children JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1502 OP 1508 DO 10.1136/hrt.2009.173328 VO 96 IS 18 A1 McLeod, Karen A YR 2010 UL http://heart.bmj.com/content/96/18/1502.abstract AB