1 Danish Hospital for Rheumatic Diseases, 6200 Sonderborg, Denmark.
2 Thrombosis and Haemostasis, Guy's and St Thomas' NHS Foundation Trust, London, UK.
3 Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, Department of Clinical and Biological Sciences, University of Turin, Italy.
4 Nephrology and Dialysis, Department of Clinical and Biological Sciences, University of Turin, Italy.
5 School of Specialization of Clinical Pathology, Department of Clinical and Biological Sciences, University of Turin, Italy.
6 Arthritis Research UK Epidemiology Unit, Faculty of Biology, Medicine and Health, Manchester Academic Health Sciences Centre, The University of Manchester, NIHR Manchester Musculoskeletal Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre Manchester, Manchester, UK.
7 Centre for Rheumatology Research, UCL Division of Medicine, University College London, London, UK.
8 Women's Health, University College London Hospital, London, UK.
9 Rheumatology Department, Clinica Universidad de Navarra, Madrid, Spain.
10 Department of Haematology, Haemostasis Research Unit, University College London, London, UK.
11 Department of Haematology, University College London Hospitals NHS Foundation Trust, London, UK.
12 University of Birmingham College of Medical and Dental Sciences, Birmingham, UK.
13 Centre for Rheumatology, Division of Medicine, University College London, London, UK.
14 Copenhagen Lupus and Vasculitis Clinic, Copenhagen University Hospital, Copenhagen, Denmark.
15 Department of Vascular Medicine, Academic Medical Center, Amsterdam, Netherlands.
16 Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
17 Department of Haematology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK.
18 Department of Medicine, Hospital for Special Surgery, Weill Cornell Medicine, New York, NY, USA.
19 Division of Rheumatology, McGill University Health Centre, Montreal, QC, Canada.
20 Centre for Outcomes Research and Evaluation, Research Institute of the McGill University Health Centre, Montreal, QC, Canada.
21 Department of Rheumatology, Odense University Hospital, Odense, Denmark.
22 Liverpool Women's Hospital, Liverpool Women's NHS Foundation Trust, Liverpool, UK.