1. Institute of Sports Medicine, Department of Orthopedic Surgery M, Bispebjerg Hospital and Centre for Healthy Aging, Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
2. Department of Physical Therapy; Bispebjerg Hospital; Copenhagen Denmark
3. Center for Health and Rehabilitation; Danish Association of Rheumatism; Denmark
4. Department of Orthopaedic Surgery; Amager Hospital; Copenhagen Denmark
5. Department of Community Medicine and Rehabilitation, Rehabilitation Medicine; Umeå University; Umeå Sweden
6. Bergen University College; Bergen Norway
7. Team Denmark; Copenhagen Denmark
8. Department of Kinesiology; University of North Carolina; Charlotte North Carolina USA