1. Centre for Rheumatology, Department of Medicine, The Middlesex Hospital University College London, London, UK; Centre for Rheumatology, 4th Floor, Arthur Stanley House, 40-50 Tottenham Street, London W1T 4NJ, UK.,
2. Medical School, University of Birmingham, Birmingham, UK
3. Department of Paediatric Rheumatology, British Columbia Children Hospital, British Columbia, Canada
4. Department of Rheumatology, University College London, London, UK