[1] St Georges Univ London, Cardiol Clin Acad Grp, London, England
[2] Royal Victoria Hosp, Belfast, Antrim, North Ireland
[3] Royal Brompton & Harefield NHS Fdn Trust, London, England
[4] Royal Brompton & Harefield NHS Fdn Trust, Harefield, Middx, England
[5] Galway Univ Hosp, Galway, Ireland
[6] Univ Hosp Galway, Galway, Ireland
[7] Blackpool Victoria Hosp, Blackpool, England
[8] Lancashire Cardiac Ctr, Blackpool, England
[9] Northern Gen Hosp, Sheffield, S Yorkshire, England
[10] Royal Sussex Cty Hosp, Brighton, E Sussex, England
[11] St Bartholomews Hosp, London, England
[12] Univ Hosp Wales, Cardiff, S Glam, Wales
[13] Univ Hosp Coventry, Coventry, W Midlands, England
[14] Queen Elizabeth Hosp, Birmingham, W Midlands, England
[15] Glenfield Hosp, Leicester, Leics, England