1. Medical Back Neck Centre, The Hague and Rugpoli Brabant Tilburg, the Netherlands
2. Department of Rehabilitation, Medical Centre Alkmaar, Alkmaar, the Netherlands
3. Department of Epidemiology and Biostatistics and the EMGO+ Institute for Health and Care Research, VU University Medical Centre, Amsterdam, the Netherlands
4. Department of Neurosurgery, Medical Center Haaglanden, Gravenhage, the Netherlands
5. The George Institute for Global Health, University of Sydney, Australia
6. Department of Health Sciences and the EMGO+ Institute for Health and Care Research, Faculty of Earth and Life Sciences, VU University Amsterdam, the Netherlands