[1] Univ Med Ctr Hamburg Eppendorf, Hamburg Ctr Hlth Econ, Dept Hlth Econ & Hlth Serv Res, Martinistr 52, D-20246 Hamburg, Germany
[2] African Populat & Hlth Res Ctr, Nairobi, Kenya
[3] Southern Cross Univ, Fac Hlth, Natl Ctr Naturopath Med, Lismore, NSW, Australia
[4] Mahidol Univ, Fac Publ Hlth, Dept Hlth Educ & Behav Sci, Bangkok, Thailand
[5] Sefako Makgatho Hlth Sci Univ, Dept Publ Hlth, Pretoria, South Africa
[6] Asia Univ, Coll Med & Hlth Sci, Dept Healthcare Adm, Taichung, Taiwan
[7] Philipps Univ Marburg, Univ Hosp Marburg, Baldingerstr, D-35043 Marburg, Germany
[8] Bezmialem Vakif Univ, Fac Med, Dept Geriatr Med, Istanbul, Turkiye
[9] Univ Palermo, Dept Internal Med, Geriatr Sect, Palermo, Italy
[10] Anglia Ruskin Univ, Ctr Hlth Performance & Wellbeing, Cambridge, England
[11] Univ Paris Cite, Lariboisiere Fernand Widal Hosp, AP HP, Dept Phys Med & Rehabil, Paris, France
[12] Univ Paris Cite, Epidemiol Ageing & Neurodegenerat Dis EpiAgeing, INSERM, U1153, Paris, France
[13] ISCIII, CIBERSAM, Parc Sanitari St Joan Deu, Res & Dev Unit, Dr Antoni Pujadas 42, Barcelona, Spain
[14] Univ Free State, Dept Psychol, Bloemfontein, South Africa
[15] Asia Univ, Coll Med & Hlth Sci, Dept Psychol, Taichung, Taiwan