1 Research Unit for Musculoskeletal Function and Physiotherapy, University of Southern Denmark, Odense, Denmark.
2 University of Melbourne Department of Surgery, St. Vincent's Hospital, Australia.
3 LaTrobe Sport and Exercise Medicine Research Centre, School of Allied Health,College of Science, Health and Engineering, La Trobe University, Melbourne, Australia.
4 Department of Physical Therapy, Institute of Health Policy, Managementand Evaluation, University of Toronto, Toronto, Canada.
5 Health Care and Outcomes Research, Krembil Research Institute, University Health Network, Toronto, Canada.
6 Bone and Joint Canada, Canadian Orthopaedic Foundation, Toronto, Canada.
7 Arthritis Clinic and Research Center, Peking University People's Hospital, Beijing, China.
8 Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark.