1. Rheumatology Unit; UCL Institute of Child Health; University College London; London UK
2. Scientific Research Laboratory; Cell Medica; London UK
3. Division of Infection and Immunity; Department of Immunology; University College; London UK
4. Department of Paediatric Immunology; Great North Children's Hospital; Newcastle upon Tyne Hospitals NHS Foundation Trust; Newcastle upon Tyne UK
5. Musculoskeletal Research Group; Institute of Cellular Medicine; Newcastle University, and Great North Children's Hospital; London UK
6. Arthritis Research UK Centre for Adolescent Rheumatology; University College; London UK