2 Infection Immunity and Inflammation Research and Teaching Department UCL Great Ormond Street Institute of Child Health, London, UK.
3 Centre for Adolescent Rheumatology Versus Arthritis at UCL, University College London Hospitals (UCLH) and Great Ormond Street Hospital (GOSH), London, UK.
4 Centre for Rheumatology Research, Division of Medicine, University College London, London, UK.
5 Centre for Epidemiology, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester Academic Health Sciences Centre, Manchester, UK.
6 National Institute of Health Research Manchester Biomedical Research Centre, Manchester University NHS Trust, Manchester, UK.
7 National Institute of Health Research Biomedical Research Centre at GOSH, London, UK.