1. Division of Medicine, Centre for Rheumatology, University College , London, UK
2. Department of Rheumatology, University College London Hospitals NHS Foundation Trust, London, UK
3. Università Vita-Salute San Raffaele, Milan, Italy
4. Department of Haematology, Haemostasis Research Unit, University College London, London, UK
5. Department of Haematology, University College London Hospitals NHS Foundation Trust, London, UK
6. Serviço de Medicina 1, Hospital de Santo André, Centro Hospitalar de Leiria, Leiria, Portugal