1. Department of Rheumatology, University College London Hospitals NHS Foundation Trust, London, UK
2. Department of Internal Medicine, Hospital de Santa Maria, Lisbon, Portugal
3. Department of Haematology, University College London Hospitals NHS Foundation Trust
4. Haemostasis Research Unit, Department of Haematology, University College London
5. Centre for Rheumatology, Division of Medicine, University College London, London, UK