[1] Univ Helsinki, Cent Hosp, Coagulat Disorders Unit, Dept Hematol,HUSLAB Lab Serv, Helsinki, Finland
[2] Univ Helsinki, Cent Hosp, Coagulat Disorders Unit, Dept Clin Chem,HUSLAB Lab Serv, Helsinki, Finland
[3] Univ Helsinki, Fac Med, Helsinki, Finland
[4] Univ Helsinki, Cent Hosp, Res Inst, Helsinki, Finland