1. Therapies Department, Royal National Orthopaedic Hospital NHS Trust, Middlesex, UK
2. Population Health Research Institute, St George's, University of London, London, UK
3. Institute for Global Health and Development, Queen Margaret University, Musselburgh, UK
4. Department of Psychology, City, University of London, London, UK
5. Department of Clinical Health Psychology, Royal National Orthopaedic Hospital NHS Trust, London, UK
6. Pain Clinic, Royal National Orthopaedic Hospital NHS Trust, London, UK