1. Department of Molecular Medicine and Surgery, Section of Orthopaedics and Sports Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm;
2. Swedish Knee Arthroplasty Register, Lund;
3. Faculty of Medicine, Department of Clinical Sciences Lund, Orthopedics, Lund University, Lund;
4. Swedish Hip Arthroplasty Register, Gothenburg;
5. Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden