1. Department of Cardiology; Leeds Teaching Hospitals; Leeds UK
2. Centre for Epidemiology and Biostatistics; University of Leeds; Leeds UK
3. Department of Cardiology; York Teaching Hospital; York UK
4. Department of Cardiac Surgery; Royal Brompton Hospital; London UK
5. Department of Cardiology and Cardiac Surgery; King's College Hospital; London UK
6. Sussex Cardiac Centre; Brighton and Sussex University Hospitals; Brighton UK
7. National Institute for CV Outcomes Research; University College London; London UK
8. Department of Cardiology; James Cook University Hospital; Middlesborough UK
9. Department of Cardiology; Queen Elizabeth Hospital; Birmingham UK