1. Department of Geriatric Psychiatry, Diakonhjemmet Hospital Oslo Norway
2. Vestfold Hospital TrustNorwegian National Advisory Unit on Aging and Health Toensberg Norway
3. Institute of Health and SocietyUniversity of Oslo Oslo Norway
4. Department of Geriatric MedicineOslo University Hospital Oslo Norway
5. Centre for Old Age Psychiatric Research, Innlandet Hospital Trust, Ottestad Norway
6. Institute of Clinical Medicine, Campus Ahus, University of Oslo Oslo Norway
7. Health Services Research UnitAkershus University Hospital Lørenskog Norway