[1] Univ Dublin, St Vincents Hosp, Dept Geriatr Med, Dublin, Ireland
[2] Royal Victoria Hosp, Cardiovasc Invest Unit, Newcastle Upon Tyne, Tyne & Wear, England
[3] Royal Victoria Hosp, MRC, Dev Ctr Brain Ageing, Care Elderly Off, Newcastle Upon Tyne, Tyne & Wear, England