1. Centre for Clinical and Health Service Research; University of Hertfordshire; Hatfield UK
2. Institute of Psychiatry, Psychology and Neuroscience; University of Hertfordshire; Hatfield UK
3. Whittington Hospital NHS Trust; London UK
4. University of Hertfordshire; Hatfield UK
5. Arthritis UK Pain Centre; University of Nottingham; Nottingham UK
6. New Cross Hospital; Wolverhampton UK
7. St Georges University Hospitals NHS Foundation Trust; London UK