1. Adult Congenital Heart Centre and Centre for Pulmonary Hypertension, Royal Brompton Hospital, Royal Brompton & Harefield Hospitals, Guy's and St Thomas' NHS Foundation Trust , Sydney Street, SW3 6NP London , UK
2. National Heart and Lung Institute, Imperial College London , Guy Scadding Building, Dovehouse Street, SW3 6LY London , UK
3. ACHD Unit, IRCCS-Policlinico San Donato , San Donato Milanese , Milan, Italy
4. Congenital Cardiac Centre, Southampton General Hospital, University Hospital Southampton NHS Foundation Trust , Southampton , UK
5. Department of Medical Rehabilitation, Medical Faculty University of Rijeka , Rijeka , Croatia
6. UniSR - Vita Salute Sal Raffaele University , Milan , Italy