[1] Univ Colorado Denver, Childrens Hosp Denver, Sch Med, Pediat Cardiac Crit Care Program,Dept Pediat, Aurora, CO 80045 USA
[2] Childrens & Matern Hosp Linz, Linz, Austria
[3] Univ Freiburg Klinikum, Zentrum Kinder & Jugendmed, Freiburg, Germany
[4] Univ Pittsburgh, Sch Med, Dept Pediat, Childrens Hosp Pittsburgh, Pittsburgh, PA 15261 USA
[5] Childrens Univ Hosp Geneva, Geneva, Switzerland
[6] Tech Univ Munich, Deutsch Herzzentrum Munchen, Dept Pediat Cardiol & Congenital Heart Dis, Munich, Germany
[7] Herz & Diabet Zentrum, Bad Oeynhausen, Germany