[1] Univ Leicester, Leicester Royal Infirm, Dept Cardiovasc Sci, Leicester, Leics, England
[2] Univ London Imperial Coll Sci Technol & Med, Int Ctr Circulatory Hlth, London SW7 2AZ, England
[3] St Marys Hosp, London, England
[4] Univ Cambridge, Addenbrookes Hosp, Clin Pharmacol Unit, Cambridge CB2 1TN, England
[5] Moorfield House Surg, Leeds, W Yorkshire, England
[6] Univ Glasgow, Western Infirm, Gardiner Inst,Div Cardiovasc & Med Sci, Sect Clin Pharmacol & Stroke Med, Glasgow G11 6NT, Lanark, Scotland
[7] Univ Leicester, Glenfield Hosp, Dept Cardiovasc Sci, Ageing & Stroke Med Sect, Leicester, Leics, England