RT Journal Article SR Electronic T1 Aortic valve surgery in children JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1182 OP 1189 DO 10.1136/hrt.2009.190520 VO 97 IS 14 A1 Yves d'Udekem YR 2011 UL http://heart.bmj.com/content/97/14/1182.abstract AB