1. Departments of Surgical and Perioperative Sciences (P.W., F.T., A.N., P.N.), Sports Medicine
2. Department of Community Medicine and Rehabilitation (P.W., F.T., A.N.), Rehabilitation Medicine
3. Department of Community Medicine and Rehabilitation (P.W., F.T., P.N.), Geriatric Medicine
4. Department of Public Health and Clinical Medicine (L.W.), Epidemiology and Public Health Sciences
5. Department of Public Health and Clinical Medicine (G.H.), Nutritional Research
6. Department of Public Health and Clinical Medicine (P.W.F.), Medicine, Umeå University, 90185 Umeå, Sweden