1. Zuyderland Medical Center, Dept. Of Orthopaedic Surgery and Traumatology, Heerlen, The Netherlands
2. Care and Public Health Research Institute (CAPHRI), Maastricht University, Dept. Of Health Services Research, Maastricht, The Netherlands
3. Maastricht University Medical Center, dept. of Orthopaedics, Maastricht, The Netherlands
4. School of Health Professions Education (SHE), Maastricht University, Maastricht, The Netherlands