[1] Univ Limerick, Irish World Acad Mus & Dance, Ageing Res Ctr, Hlth Res Inst, Limerick V94 T9PX, Ireland
[2] Univ Calif San Francisco, Dept Med, Div Geriatr, San Francisco, CA 94143 USA
[3] Trinity Coll Dublin, Ctr Ageing Neurosci & Humanities, Dublin D02 PN40, Ireland
[4] Univ Limerick, Glucksman Lib, Limerick V94 T9PX, Ireland