1. Thule Institute, University of Oulu, Oulu, Finland
2. Arctic Health, Faculty of Medicine, University of Oulu, Oulu, Finland
3. Department of health and care sciences, UiT The Arctic University of Norway, Tromsø, Norway
4. Faculty of education, arts and sports, Western Norway University of Applied Science, Bergen, Norway
5. Division of Health, Medicine and Rehabilitation, Luleå University of Technology, Luleå, Sweden
6. Department of Physical Therapy, Faculty of Medicine, University of Iceland, Reykjavík, Iceland