RT Journal Article SR Electronic T1 Test occlusion of Fontan fenestration: unique contribution of interventional MRI JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 89 OP 89 DO 10.1136/hrt.2010.203687 VO 97 IS 1 A1 Aphrodite Tzifa A1 Reza Razavi YR 2011 UL http://heart.bmj.com/content/97/1/89.abstract AB