1 Department of Pediatric Cardiology, Intensive Care Medicine and Neonatology, University Medical Center, Georg-August-University Göttingen, Germany. (U.K., H.E.S., M.J.M., T.P.).
2 Department of Cardiology and Pneumology, Heart Center, University Medical Center, Georg-August-University Göttingen, Germany. (L.B., M.Z.).