1. Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg;
2. Department of Surgery and Orthopaedics, Kungälv Hospital;
3. The Swedish Hip Arthroplasty Register;
4. Department of Orthopedics, Clinical Sciences, Lund University and Skåne University Hospital, Lund, Sweden;
5. The Swedish Knee Arthroplasty Register