1. Centre for Rheumatology, Division of Medicine, University College London, London, UK
2. Department of Rheumatology, University College London Hospitals NHS Foundation Trust, London, UK
3. Università Vita-Salute San Raffaele, Milan, Italy
4. Haemostasis Research Unit, Department of Haematology, University College London, London, UK
5. Department of Haematology, University College London Hospitals NHS Foundation Trust, London, UK