1. Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands
2. Department of Manual Therapy, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium
3. Department of Physiotherapy, International Research Group - Pain in Motion-, Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium
4. Practice Physiotherapy and Manual Therapy, Heeswijk-Dinther, Netherlands,
5. Department of Public Health and Research, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands
6. SOMT University of Physiotherapy, Amersfoort, Netherlands
7. Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium