1. Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Orthopedic Surgery, Spaarne Gasthuis, Hoofddorp, the Netherlands
3. Department Oral Cell Biology, Academic Centre for Dentistry (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
4. Directorate of Research Policy (Formerly: Walaeus Library), Leiden University Medical Centre, Leiden, The Netherlands
5. Department of Orthopaedics, Reinier Haga Orthopaedic Centre, Zoetermeer, Netherlands