1. Geriatric DepartmentUniversitair Ziekenhuis Brussel, Laarbeeklaan 101, Brussels B-1090, Belgium.
2. Geriatric DepartmentHôpital Académique Erasme, Brussels, Belgium
3. Geriatric Department, Centre Hospitalier Universitaire Brugmann, Free University of Brussels (VUB/ULB), Brussels, Belgium