University College London, National and Kapodistrian University of Athens, University College London, University College London - Centre for Rheumatology Research, University College London, University College London, Vascular Noninvasive Diagnostic Centre, Imperial College London, University College London - Centre for Adolescent Rheumatology Versus Arthritis, University College London, University College London and University College London - GOSH and Centre for Rheumatology Research

University College London, University College London, University College London, University College London - University College London Hospitals NHS Foundation Trust, University College London, Newcastle Upon Tyne Hospitals NHS Foundation Trust, University College London - University College London Hospitals NHS Foundation Trust, Sheffield Teaching Hospitals NHS Foundation Trust, University College London - Centre for Adolescent Rheumatology Versus Arthritis, Government of the United Kingdom - Royal Wolverhampton NHS Trust, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Sheffield Teaching Hospitals NHS Foundation Trust, University of Southampton, University of Southampton - University Hospital Southampton NHS Foundation Trust, Department of Haematology, University College London - GOSH and Centre for Rheumatology Research and University College London