1. University of Palermo, Italy
2. Department of Medical Sciences and Public Health, Sports Physiology Laboratory, University of Cagliari, Italy
3. Department of Paediatric Cardiology and Cardiac Surgery Bambino Gesù Paediatric Hospital, Rome, Italy
4. Royal Brompton and Harefield NHS Foundation Trust, Imperial College of London, UK
5. University College of Dublin, Mater Misericordiae University Hospital, Republic of Ireland