1. Oxford Heart Centre Oxford University Hospitals NHS Foundation Trust Oxford Oxfordshire UK
2. Department of Cardiovascular Medicine University of Oxford Oxford Oxfordshire UK
3. Department of Medicine, Division of Cardiology University of Verona Verona Italy
4. Keele Cardiovascular Research Group, Centre for Prognosis Research Keele University, UK and Heart Centre, Thomas Jefferson University Philadelphia USA
5. Department of Epidemiology and Biostatistics Schulich School of Medicine & Dentistry, Western University London Ontario Canada