1. The Norwegian National Centre for Ageing and Health, Vestfold Hospital Trust, Tønsberg, Norway
2. Department of Psychiatry, Levanger Hospital, Nord-Trøndelag Hospital Trust, Levanger, Norway
3. Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
4. Department of Geriatric Medicine, Oslo University Hospital, Oslo, Norway
5. Department of Physical Health and Ageing, Norwegian institute of Public Health, Oslo, Norway
6. Research Centre for Age-related Functional Decline and Disease, Innlandet Hospital Trust, Ottestad, Norway
7. Department of Psychiatry, Namsos Hospital, Nord-Trøndelag Hospital Trust, Namsos, Norway
8. Division of Psychiatry, University College London, London, UK
9. Camden and Islington NHS Foundation Trust, London, UK
10. Department of Public Health and Nursing, HUNT Research Centre, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
11. Levanger Hospital, Nord-Trøndelag Hospital Trust, Levanger, Norway
12. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway