Affiliation: | 1. Department of Circulation and Medical Imaging, Faculty of Medicine, Medical Technology Research Centre, KG Jebsen Center of Exercise in Medicine, Norwegian University of Science and Technology (NTNU), P.O. box 8905, 7491, Trondheim, Norway 2. Department of Rheumatology, St. Olavs Hospital, Trondheim, Norway 3. Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway 4. Norwegian Health Association, Oslo, Norway 5. St. Olavs Hospital, Trondheim, Norway
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