1. Department of Paediatric Cardiology; Evelina London Children's Hospital, Guy's and St. Thomas' Hospital; London United Kingdom
2. Paediatric Cardiology Unit, Padeh-Poriya Medical Center; Tiberias Israel
3. Cardiology Department; Polish Mother's Memorial Hospital, Research Institute; Lodz Poland
4. Department of Congenital Cardiology; University of Colorado; Denver Colorado
5. Department of Pediatric Cardiology; Erasmus Medical Centre; Rotterdam Netherlands