1. Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health (NIPH), Oslo
2. Department of Physiotherapy, OsloMet, Oslo Metropolitan University
3. Department of Health and Care Sciences, UiT The Arctic University of Norway, Tromsø
4. Department of Clinical Therapeutic Services, University Hospital of Northern Norway, Tromsø
5. Department of Clinical Medicine, University Hospital of Northern Norway, Tromsø
6. Division of Medicine and Laboratory Sciences, Akershus University Hospital, Lørenskog, Norway
7. MRC Unit for Lifelong Health and Ageing at UCL, UK