1. Whittington Hospital NHS Trust, London, UK, and Early Rheumatoid Arthritis Study, St. Albans City Hospital; St. Albans UK
2. Institute of Psychiatry, Psychology and Neuroscience, and Faculty of Life and Medical Science, King's College London; London UK
3. Centre for Lifespan and Chronic Illness Research, University of Hertfordshire; Hatfield UK
4. New Cross Hospital; Wolverhampton UK
5. Arthritis UK Pain Centre, University of Nottingham; Nottingham UK
6. St. Georges University Hospitals NHS Foundation Trust; London UK
7. Early Rheumatoid Arthritis Study, St. Albans City Hospital; St. Albans UK