1. Research Centre for Age-Related Functional Decline and Disease, Innlandet Hospital Trust, Ottestad, Norway
2. General Practice Research Unit, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
3. Norwegian National Advisory Unit on Ageing and Health, Vestfold Hospital Trust, Tønsberg, Norway
4. Institute of Clinical Medicine, Campus Ahus, University of Oslo, Oslo, Norway
5. Health Services Research Unit, Akershus University Hospital, Lørenskog, Norway
6. Department of Geriatric Medicine, Oslo University Hospital, Oslo, Norway
7. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway