1. Concordia Joint Replacement Group, Winnipeg, Manitoba, Canada
2. Canadian Joint Replacement Registry, University of Manitoba, Concordia Joint Replacement Group, Winnipeg, Manitoba, Canada
3. Geneva Arthroplasty Registry, Division of Orthopaedic Surgery, Geneva University Hospitals, Geneva, Switzerland
4. Hospital for Special Surgery and Weill Cornell Medical College, New York, New York, USA
5. Danish Hip Arthroplasty Register, University of Southern Denmark, Odense, Denmark
6. Swedish Hip Arthroplasty Register and Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
7. Swedish Knee Arthroplasty Register, Skåne University Hospital, Lund, Sweden
8. University of Sheffield, Sheffield, United Kingdom
9. Canadian Joint Replacement Registry, Dalhousie University, Halifax, Nova Scotia, Canada