1. Pain and Anaesthesia Research Centre, Barts Health NHS Trust, London, UK
2. Institute of Health Research, University of Exeter Medical School, University of Exeter, Exeter, UK
3. Department of Pain Management, Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, UK
4. Department of Pain Medicine, The Walton Centre NHS Foundation Trust, Liverpool, UK
5. Swansea Centre for Health Economics, College of Human and Health Sciences, Swansea University, Swansea, UK
6. Locomotor Pain Service, Homerton University Hospital NHS Foundation Trust, London, UK