[1] Univ Leuven, KU Leuven, Dept Chron Dis Metab & Ageing, Gerontol & Geriatr, Herestr 49, B-3000 Leuven, Belgium
[2] Univ Basel, Dept Publ Hlth, Nursing Sci, Bernoullistr 28, CH-4056 Basel, Switzerland
[3] UCLouvain, Clin Univ St Luc, Geriatr Med, Louvain La Neuve, Belgium
[4] UCLouvain, Res Inst Hlth & Soc, Louvain La Neuve, Belgium
[5] Copenhagen Univ Hosp, Danish Geriatr Soc, Herlev Ringvej 75, DK-2730 Herlev, Denmark
[6] Copenhagen Univ Hosp, Herlev & Gentofte, Herlev Ringvej 75, DK-2730 Herlev, Denmark
[7] Estonian Assoc Gerontol & Geriatr EGGA, Puusepa 8,L6027, EE-51014 Tartu, Estonia
[8] Univ Tartu, Puusepa 8,L6027, EE-51014 Tartu, Estonia
[9] HAGG, Kaniggos 23, Athens 10677, Greece
[10] Iceland Geriatr Soc, Hringbraut 101, Reykjavik, Iceland
[11] Landspitali Univ Hosp, Hringbraut 101, Reykjavik, Iceland
[12] Tallaght Univ Hosp, Irish Soc Phys Geriatr Med, Dublin, Ireland
[13] Tallaght Univ Hosp, Dept Age Related Healthcare, Dublin, Ireland
[14] Rehabil Hosp Karin Grech, Geriatr Med Soc Malta & Telghet Gmangia, Pieta, Malta
[15] Univ Med Ctr Ljubljana, Slovene Geriatr Med Soc, Vodnikova 62, Ljubljana 1000, Slovenia
[16] Univ Med Ctr Ljubljana, Div Internal Med, Geriatr Med Unit, Vodnikova 62, Ljubljana 1000, Slovenia
[17] Univ Hosp Leuven, Belgian Soc Gerontol & Geriatr, Herestr 49, B-3000 Louvain, Belgium
[18] Univ Hosp Leuven, Dept Geriatr Med, Herestr 49, B-3000 Louvain, Belgium