[1] St Marys Hosp, Dept Anaesthesia, London, England
[2] St Marys Hosp, Dept Intens Care, London, England
[3] Spring Vale Med Ctr, Whitby Grp Practice, Whitby, England
[4] Hull York Med Sch, Kingston Upon Hull, N Humberside, England
[5] Torbay Hosp, Dept Anaesthesia, Torquay, England
[6] Torbay Hosp, Dept Perioperat Med, Torquay, England
[7] Torbay Hosp, Dept Intens Care, Torquay, England
[8] Univ Manchester, Inst Cardiovasc Sci, Manchester, Lancs, England
[9] British Hypertens Soc, Bristol, Avon, England
[10] Manchester Royal Infirm, Dept Anaesthesia, Oxford Rd, Manchester M13 9WL, Lancs, England
[11] Guys & St Thomas Hosp, Dept Ageing & Hlth, London SE1 9RT, England
[12] Univ Manchester, Dept Med, Manchester M13 9PL, Lancs, England