[1] Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden
[2] Karolinska Inst, Dept Lab Med, Div Clin Chem, Stockholm, Sweden
[3] Karolinska Univ, Huddinge Hosp, Stockholm, Sweden
[4] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Dept Med,Div Thrombosis & Hemostasis, Boston, MA 02215 USA