1. Department of Orthopedics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2. Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
3. Department of Orthopedics, Röpcke-Zweers Hospital Hardenberg, Hardenberg, The Netherlands
4. Department of Orthopedics, Medical Center Leeuwarden, Leeuwarden, The Netherlands
5. Department of Orthopedics, Martini Hospital Groningen, Groningen, The Netherlands
6. Coronel Institute of Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands