1. Department of Cardiology; Castle Hill Hospital, University of Hull; Kingston upon Hull HU16 5JQ UK
2. Department of Primary Care and General Practice; University of Birmingham; Birmingham B15 2TT UK
3. Institute of Cardiovascular Research, Leeds General Infirmary; Leeds LS1 3EX UK
4. Department of Cardiothoracic Surgery; Queen Elizabeth Hospital; Birmingham B15 2TH UK
5. Wolverhampton Hospitals NHS Trust, New Cross Hospital; Wolverhampton WV10 0QP UK
6. Cardiovascular Magnetic Resonance Unit; Royal Brompton Hospital; London SW3 6NP UK
7. Cardiac Research Department; Northwick Park Hospital; Harrow Middlesex HA1 3UJ UK