German Heart Center Berlin - Department of Congenital Heart Disease and Pediatric Cardiology, Charité - Universitätsmedizin Berlin - Department of Pediatric Cardiology, Saarland University - Department for Paediatric Cardiology, Hannover Medical School - Department of Paediatric Cardiology and Intensive Care Medicine, University of Leipzig - Clinic for Paediatric Cardiology, University Hospital Erlangen - Department for Paediatric Cardiology, University of Freiburg - Department for Paediatric Cardiology, University Heart Center Hamburg GmbH - Department for Paediatric Cardiology, University of Tübingen - Department for Paediatric Cardiology, Ruhr University of Bochum - Center for Congenital Heart Disease/Pediatric Cardiology, University Hospital Münster - Department for Paediatric Cardiology, Ludwig Maximilian University of Munich (LMU) - Department of Paediatric Cardiology and Paediatric Intensive Care, Klinikum Links der Weser - Department for Paediatric Cardiology, German Heart Centre Munich - Department for Paediatric Cardiology, University of Cologne - Department for Paediatric Cardiology, University Hospital Giessen - Department for Paediatric Cardiology, University Hospital Ulm - Pediatric Cardiology, University Medicine Göttingen - Department for Paediatric CardiologyUniversity Medicine Göttingen - Department for Paediatric Cardiology, Schleswig-Holstein University - Department for Paediatric CardiologySchleswig-Holstein University - Department for Paediatric Cardiology, RWTH Aachen University - Pediatric CardiologyRWTH Aachen University - Pediatric Cardiology, University of Bonn - Pediatric Cardiology, Stuttgart Clinic - Olgahospital / Women's Clinic, Heidelberg University Hospital - Pediatric Cardiology and Congenital Heart Defects, Competence Network for Congenital Heart Defects, University of Tübingen - Cardiopathology, DZHK - German Centre for Cardiovascular Research and German Heart Center Berlin - Department of Congenital Heart Disease and Pediatric Cardiology