1. Musculoskeletal Research Unit, School of Clinical Sciences, University of Bristol, Bristol, UK
2. Warwick Clinical Trials Unit, University of Warwick, Warwick, UK
3. Centre for Pain Research, University of Bath, Bath, UK
4. Department of Experimental-Clinical and Health Psychology, Ghent University, Ghent, Belgium
5. Avon Orthopaedic Centre, Department of Trauma and Orthopaedics, North Bristol NHS Trust, Bristol, UK