[1] Univ Nebraska, Coll Med, Div Cardiol, Omaha, NE 68198 USA
[2] Childrens Hosp & Med Ctr, Omaha, NE 68114 USA
[3] Tech Univ Munich, German Heart Ctr Munich, Dept Paediat Cardiol & Congenital Heart Dis, Munich, Germany
[4] Univ Hosp Munich, Dept Cardiovasc Med, Div Adult Congenital & Valvular Heart Dis, Munich, Germany