1. Prince Sultan Cardiac Centre; Department of Cardiology; P.O. Box: 7897 Riyadh Saudi Arabia 11565
2. University of East Anglia; Research & Development Office; Level 3 East Norfolk and Norwich University Hospitals NHS Foundation Trust, Colney Lane Norwich UK NR4 7UY
3. The Royal Brompton Hospital Harefield NHS Trust; Department of Cardiology; Sydney Street London UK SW3 6LP
4. Imperial College London, National Heart and Lung Institute; London UK
5. University of East Anglia; Elizabeth Fry Building University of East Anglia Norwich Norfolk UK NR4 7TJ