1. Department of Clinical Cardiology, National Heart & Lung Institute; Imperial College; Royal Brompton Campus London UK
2. Department of Cardiology; Western Infirmary; Glasgow UK
3. Department of Cardiovascular Medicine; National Heart & Lung Institute, Charing Cross Hospital; London UK
4. Department of Cardiology; Royal Infirmary; Glasgow UK
5. Academic & Clinical Department of Cardiovascular Medicine; St. Mary*s Wing, Whittington Hospital & UCL; London UK