1. Department of Cardiology, University Medical Centre Ljubljana, Zaloška 2, 1000 Ljubljana Slovenia
2. Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia
3. Division of Adult Congenital Heart Disease, Department of Cardiovascular Medicine, University Hospital Centre Zagreb, Kispaticeva ul. 12, Zagreb 10000, Croatia
4. Department of Medical Rehabilitation, Medical Faculty University of Rijeka, Ulica Braće Branchetta 20/1, Rijeka 51000, Croatia
5. Adult Congenital Heart Centre and National Centre for Pulmonary Hypertension, Royal Brompton & Harefield Hospitals, Guys and St Thomas’ NHS Trust, and Imperial College, Sydney Street, London SW3 6NP, UK