Richard A. Watts, University of East Anglia and Ipswich Hospital NHS Trust, UK, Philip G. Conaghan, University of Leeds and Leeds Teaching Hospitals NHS Trust, UK, Christopher Denton, University College London, UK, Helen Foster, Musculoskeletal Research Group, Newcastle University, Medical School, John Isaacs, University of Newcastle, , Ulf Müller-Ladner, Justus-Liebig Universität Giessen,