1. Department of Cardiology; Monaldi Hospital; Second University of Naples; Naples Italy
2. Adult Congenital Heart Centre and Centre for Pulmonary Hypertension; Royal Brompton Hospital; London United Kingdom
3. Heart Department; University of Salerno; Salerno Italy
4. Department of Cardiovascular and Respiratory Disease; University La Sapienza; Rome Italy
5. Department of Pulmonary Diseases; VU University Medical Center; Amsterdam The Netherlands
6. Department of Pulmonology; Mater Misericordiae University Hospital; Dublin Ireland
7. Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow United Kingdom
8. Department of Pathophysiology; Erasme University Hospital; Brussels Belgium