1. Division of Epidemiology & Public Health University of Nottingham Nottingham U.K.
2. Nottingham University Hospitals NHS Trust Nottingham U.K.
3. Watford General Hospital Watford U.K.
4. Centre of Evidence Based Dermatology Division of Rheumatology & Orthopaedics University of Nottingham Nottingham U.K.
5. Department of Psychology University of Sheffield U.K.