1. Kinderspital Zurich; Department of Cardiology; Steinwiesstrasse 75 Zurich Switzerland 8032
2. Medical Center - University of Freiburg; Center for Medical Biometry and Medical Informatics; Stefan-Meier-Str. 26 Freiburg Germany 79104
3. Heart Center, University of Freiburg; Department of Congenital Heart Defects and Pediatric Cardiology; Mathildenstr. 1 Freiburg Baden-Württemberg Germany 79098