[1] Univ Hosp Ghent, Dept Geriatr Med, B-9000 Ghent, Belgium
[2] Katholieke Hogesch, Dept Hlth Serv, Limburg Hasselt, Belgium
[3] Katholieke Univ Leuven, Ctr Hlth Serv & Nursing Res, B-3000 Louvain, Belgium
[4] Leuven Univ Hosp, Div Geriatr Med, Dept Internal Med, B-3000 Louvain, Belgium
[5] AZ Sint Jan Brugge Oostende, Dept Geriatr Med, B-8000 Brugge, Belgium
[6] Catholic Univ Louvain, St Luc Univ Hosp, Dept Geriatr Med, B-1200 Brussels, Belgium