[1] Univ Leicester, Glenfield Gen Hosp, Dept Cardiol, British Cardiovasc Soc Working Grp,Sch Med, Leicester LE3 9QP, Leics, England
[2] James Cook Univ Hosp, Middlesbrough, Cleveland, England
[3] Guys & St Thomas Hosp, Dept Cardiol, London SE1 9RT, England
[4] Hemel Hempstead Gen Hosp, Dept Cardiol, Hemel Hempstead, England
[5] Glenfield Gen Hosp, Dept Radiol, Leicester LE3 9QP, Leics, England
[6] Harefield Hosp, Dept Cardiol, Harefield UB9 6JH, Middx, England
[7] John Radcliffe Hosp, Oxford OX3 9DU, England
[8] Royal Brompton Hosp, CMR Unit, London SW3 6LY, England
[9] London Chest Hosp, Res & Dev Off, London E2 9JX, England
[10] Worthing Dist Hosp, Worthing, W Sussex, England
[11] Bristol Royal Infirm & Gen Hosp, Dept Clin Radiol, Bristol, Avon, England