1. Adult Congenital Heart Centre and Centre for Pulmonary Hypertension Royal Brompton Hospital Sydney Street London SW3 6NP UK
2. National Heart and Lung Institute Imperial College London London UK
3. Pulmonary Vascular Disease Unit Royal Hallamshire Hospital Sheffield UK
4. Department of Cardiology Queen Elizabeth Hospital Birmingham Birmingham UK
5. Bristol Heart Institute University Hospitals Bristol, Weston NHS Foundation Trust Bristol UK