[1] Trinity Coll Dublin, Sch Med, Dept Med Gerontol, Dublin, Ireland
[2] St James Hosp, Mercers Inst Successful Ageing, Dublin, Ireland
[3] Univ Oxford, Nuffield Dept Primary Care Hlth Sci, Med Sci Div, Oxford, England
[4] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Boston, MA USA
[5] Hebrew Senior Life, Hinda & Arthur Marcus Inst Aging Res, Boston, MA USA