1. Department of Congenital Heart Disease/Pediatric Cardiology, Deutsches Herzzentrum Berlin, Berlin, Germany
2. Department of Pediatric Cardiothoracic Surgery, Heart Institute at Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
3. Department of Pediatric Cardiology, Pediatric Heart Center, University Hospital Giessen, Justus-Liebig University, Giessen, Germany
4. Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children Hospital, Rome, Italy
5. Berlin Heart GmbH, Berlin, Germany
6. Department of Pediatrics, Hospital for Sick Children, Toronto, ON, Canada