[1] Ist Ricovero & Cura Carattere Sci, Lab Biol Vasc & Terapia Gen, Milan, Italy
[2] Univ Milan, Dept Clin Sci & Community Hlth, Milan, Italy
[3] Hokkaido Univ, Fac Med & Grad Sch Med, Dept Rheumatol Endocrinol & Nephrol, Sapporo, Japan
[4] Hokkaido Univ, Grad Sch Med, Sapporo, Japan
[5] Kings Coll London, Sch Cardiovasc & Metab Med & Sci, Acad Dept Vasc Surg, London, England
[6] Univ Coll London Hosp Natl Hlth Syst Fdn Trust, Dept Haematol, London, England
[7] UCL, Dept Haematol, Haemostasis Res Unit, London, England
[8] Univ N Carolina, Div Rheumatol Allergy & Immunol, Chapel Hill, NC 27599 USA
[9] Univ Turin, Dipartimento Sci Clin & Biol, Turin, Italy
[10] Mayo Clin, Dept Lab Med & Pathol, Dept Lab Med & Pathol, Rochester, MN USA
[11] Univ Texas Med Branch, Rheumatol Div, Antiphospholipid Standardizat Lab, Internal Med, Galveston, TX USA
[12] Weill Cornell Med, Hosp Special Surg, Barbara Volcker Ctr Women & Rheumat Dis, Div Rheumatol,Dept Med, New York, NY USA
[13] Univ Ghent, Ghent Univ Hosp, Dept Diagnost Sci, Coagulat Lab, Ghent, Belgium
[14] Univ Ghent, Dept Diagnost Sci, Ghent, Belgium