1. Cabrini Institute and Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology; Melbourne VIC Australia 3144
2. University of Helsinki; Finnish Center of Evidence based Orthopaedics (FICEBO); Helsinki Finland
3. Vanderbilt University School of Medicine; Departments of Physical Medicine and Rehabilitation, and Orthopaedics; 2201 Children's Way, Suite 1318, Nashville Tennessee USA 37202
4. Helsinki University Hospital, Töölö Hospital; Department of Orthopaedics and Traumatology; Helsinki Finland
5. University of Indianapolis; College of Health Sciences; Indianapolis USA
6. University of Helsinki; Medical Faculty; Helsinki Finland
7. South Carelia Central Hospital; Department of Surgery; Lappeenranta Finland
8. Linköping University; Division of Physiotherapy; Linköping Sweden
9. La Trobe University; School of Allied Health; Melbourne Australia
10. University of Toronto; Department of Medicine; Toronto Canada
11. Lovisenberg Diaconal Hospital; Department of Medicine; Oslo Norway
12. University of Oslo; Faculty of Medicine, Institute of Health and Society; Oslo Norway