1 I-CHER, Interuniversity Center for Health Economics Research, Belgium; Pain in Motion International Research Group, www.paininmotion.be; Department of Public Health (GEWE), Faculty ofMedicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium; Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy (KIMA), Vrije Universiteit Brussel, Brussels, Belgium; Department of Physical Medicine and Physiotherapy, Universitair Ziekenhuis Brussel, Brussels, Belgium. Electronic address: [email protected].
2 Pain in Motion International Research Group, www.paininmotion.be; Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy (KIMA), Vrije Universiteit Brussel, Brussels, Belgium; Department of Neurosurgery, Universitair Ziekenhuis Brussel, Brussels, Belgium.
3 I-CHER, Interuniversity Center for Health Economics Research, Belgium; Department of Public Health (GEWE), Faculty ofMedicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium.
4 Department of Neurosurgery, Universitair Ziekenhuis Brussel, Brussels, Belgium.
5 Department of Neurosurgery, Universitair Ziekenhuis Brussel, Brussels, Belgium; Center for Neurosciences, Faculty of Medicine & Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium; Department of Manual Therapy (MANU), Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium.
6 Pain in Motion International Research Group, www.paininmotion.be; Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy (KIMA), Vrije Universiteit Brussel, Brussels, Belgium; Department of Physical Medicine and Physiotherapy, Universitair Ziekenhuis Brussel, Brussels, Belgium.
7 Department of Public Health (GEWE), Faculty ofMedicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium; Department of Biostatistics and Medical Informatics, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium.
8 Interface Demography, Vrije Universiteit Brussel, Brussels, Belgium; Health Inequalities Research Group (GREDS),Universitat Pompeu Fabra, Barcelona, Spain.