1. From the Department of Pediatric Cardiology and Pediatric Intensive Care Medicine (R.F., T.Q., T.K., T.P., M.S.), Georg-August University, Goettingen, Germany; Pediatric Heart Center (I.M.B.), Justus-Liebig University, Giessen, Germany; Department of Pediatric Cardiology and Congenital Heart Disease (M.V.), German Heart Center Munich at the Technical University, Munich, Germany; and Department of Thoracic and Cardiovascular Surgery (W.R.), Georg-August University, Goettingen, Germany.