1. Autoimmune Disease Research Unit, Department of Internal Medicine, Hospital de Cruces, University of the Basque Country, Barakaldo, Spain
2. Lupus Research Unit, The Rayne Institute, Guy’s, King’s and St Thomas’ School of Medicine, King’s College, London, UK
3. Department of Neurology, University of Texas Health Science Center at San Antonio School of Medicine, USA
4. Division of Hematology and Thromboembolism, McMaster University, Canada
5. Department of Rheumatology and Clinical Immunology, University Medical Centre, Utrecht, The Netherlands
6. The Barbara Volcker Center for Women and Rheumatic Disease, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, USA
7. Department of Immunology, Allergy & Infectious Disease, St George Hospital, University of New South Wales, Australia
8. Department of Haematology, University College London, London, UK
9. Clinical Cardiology, University Hospital, Padova, Italy
10. Antiphospholipid Standardization Laboratory, Division of Rheumatology, Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX, USA
11. First Department of Internal Medicine, Medical School, National University of Athens, Athens, Greece