1. Monash University and University of Melbourne; Melbourne Victoria Australia
2. University of Melbourne; Melbourne Victoria Australia
3. Epworth HealthCare and University of Melbourne, Melbourne, Victoria, and Australian Orthopaedic Association National Joint Replacement Registry; Adelaide South Australia Australia
4. Monash University; Melbourne Victoria Australia
5. Coxa Hospital for Joint Replacement; Tampere Finland
6. The Norwegian Arthroplasty Register; Bergen Norway
7. The Norwegian Arthroplasty Register and University of Bergen; Bergen Norway
8. Australian Orthopaedic Association National Joint Replacement Registry; Adelaide South Australia Australia
9. Finnish Arthroplasty Register; Helsinki Finland
10. Turku University Hospital, Turku, and Finnish Arthroplasty Register; Helsinki Finland
11. Aarhus University Hospital and Danish Hip Arthroplasty Register; Aarhus Denmark
12. Swedish Hip Arthroplasty Register; Gothenburg Sweden
13. Danish Hip Arthroplasty Register, Aarhus, and Odense University Hospital and University of Southern Denmark; Odense Denmark
14. University of Gothenburg and Swedish Hip Arthroplasty Register; Gothenburg Sweden