1 Pain in Motion Research Group (PAIN), Department of Physical therapy, Human Physiology and Anatomy, Faculty of Physical Education & Physical therapy, Vrije Universiteit Brussel, Belgium; Chronic pain rehabilitation, Department of Physical Medicine and Physical therapy, University Hospital Brussels, Belgium; Department of Health and Rehabilitation, Unit of Physical therapy, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Sweden. Electronic address: jo.nijs@vub.be.
2 Pain in Motion Research Group (PAIN), Department of Physical therapy, Human Physiology and Anatomy, Faculty of Physical Education & Physical therapy, Vrije Universiteit Brussel, Belgium; Chronic pain rehabilitation, Department of Physical Medicine and Physical therapy, University Hospital Brussels, Belgium; Research Foundation - Flanders (FWO), Brussels, Belgium.