1. Department of Geriatric Medicine; Rijnland Hospital; Leiderdorp the Netherlands
2. Department of Internal Medicine; Medical Centre Alkmaar; Alkmaar the Netherlands
3. Department of Surgery; Diakonessenhuis; Utrecht the Netherlands
4. Diakonessenhuis; Utrecht the Netherlands
5. Department of Internal Medicine; Haga Hospital; Den Haag the Netherlands
6. Department of Geriatric Medicine; Diakonessenhuis; Utrecht the Netherlands