1. Spine, Head and Pain Research Unit Ghent, Department of Rehabilitation Sciences, Ghent University, 9000 Gent, Belgium
2. REVAL—Rehabilitation Research Center, Faculty of Rehabilitation Sciences, UHasselt, 3500 Diepenbeek, Belgium
3. NHMRC—Centre of Clinical Research Excellence in Spinal Pain, Injury & Health, School of Health & Rehabilitation Sciences, The University of Queensland, Brisbane 4072, Australia