[1] Dokuz Eylul Univ, Fac Med, Dept Geriatr Med, Ctr Aging Brain & Dementia, Izmir, Turkey
[2] South London & Maudsley NHS Fdn Trust, Physiotherapy Dept, Denmark Hill, London SE5 8AZ, England
[3] Kings Coll London, Inst Psychiat Psychol & Neurosci, United Kingdom & Hlth Serv, De Crespigny Pk, London SE5 8AF, England
[4] Kings Coll London, Inst Psychiat Psychol & Neurosci, Populat Res Dept, De Crespigny Pk, London SE5 8AF, England
[5] Univ Padua, Dept Med DIMED, Geriatr Sect, Padua, Italy
[6] Univ & Hosp Trust Verona, Dept Pathol & Diagnost, Verona, Italy
[7] Univ Padua, Dept Neurosci, Padua, Italy
[8] Mental Hlth Dept, Local Hlth Unit 17, Padua, Italy
[9] Inst Clin Res & Educ Med IREM, Padua, Italy
[10] CNR, Natl Res Council, Inst Neurosci, Aging Branch, Padua, Italy
[11] Univ Hosp Parma, Geriatr & Rehabil Dept, Geriatr Clin, Parma, Italy
[12] Univ Hosp Parma, Geriatr & Rehabil Dept, Lab Movement Anal, Parma, Italy
[13] Kings Coll London, Ctr Global Mental Hlth, Hlth Serv & Populat Dept, Inst Psychiat Pscyhol & Neurosci, De Crespigny Pk, London SE5 8AF, England
[14] UCL, MRC Unit Lifelong Hlth & Ageing, 33 Bedford Pl, London WC1B 5JU, England
[15] Univ Exeter, Coll Life & Environm Sci Psychol, Ctr Res Aging & Cognit Hlth, REACH, Exeter EX4 4QG, Devon, England
[16] Univ Padua, Dept Med DIMED, Nicola Veronese Geriatr Sect, Padua, Italy
[17] Inst Clin Res & Educ Med IREM, Padua, Italy
[18] Anglia Ruskin Univ, Hlth Social Care & Educ, Chelmsford, Essex, England