1. Department of Orthopaedics, Medical Center Leeuwarden, Leeuwarden;
2. Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch;
3. Department of Orthopaedics, Radboud University Medical Center, Nijmegen;
4. Department of Orthopaedics, University Medical Center Leiden, Leiden, the Netherlands