1. Department of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Emergency Medicine, Leiden University Medical Center, Leiden, The Netherlands
3. Department of Psychiatry, Leiden University Medical Center, Leiden, The Netherlands.
4. Collaborative Antwerp Psychiatric Research Institute (CAPRI), University of Antwerp, Antwerp, Belgium
5. Department of Internal Medicine, section of Acute Care, Leiden University Medical Center, Leiden, The Netherlands
6. Department of Internal Medicine, section acute care, Alrijne Hospital, the Netherlands
7. Institute for Evidence-based Medicine in Old Age (IEMO), Leiden, The Netherlands