[1] Tech Univ Munich, Deutsch Herzzentrum Munchen German Heart Ctr Muni, Dept Pediat Cardiol & Congenital Heart Dis, D-80290 Munich, Germany
[2] Childrens Hosp & Res Ctr Oakland, Dept Diagnost Imaging, Oakland, CA USA
[3] Guys & St Thomas Hosp, Evelina Childrens Hosp, NHS Fdn Trust, Dept Pediat Cardiol, London SE1 9RT, England
[4] Kings Coll London, Div Imaging Sci & Biomed Engn, London WC2R 2LS, England
[5] Med Coll Wisconsin, Childrens Hosp Wisconsin, Herma Heart Ctr, Milwaukee, WI 53226 USA
[6] UCL Inst Cardiovasc Sci, Ctr Cardiovasc Imaging, London, England
[7] Great Ormond St Hosp Sick Children, London WC1N 3JH, England
[8] Univ Childrens Hosp Zurich, Div Cardiol, Zurich, Switzerland
[9] Univ Toronto, Hosp Sick Children, Dept Diagnost Imaging, Toronto, ON M5G 1X8, Canada
[10] Univ Toronto, Hosp Sick Children, Dept Paediat, Div Cardiol, Toronto, ON M5G 1X8, Canada
[11] Harvard Univ, Sch Med, Boston Childrens Hosp, Dept Cardiol, Boston, MA USA
[12] Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA